ipc: Remove the ability to override the listener task runner

Since base::ThreadTaskRunnerHandle::Get() is now configured to return
the correct value from the start, there's no need to override the IPC
listener task runner any longer.

BUG=465354

Review URL: https://codereview.chromium.org/1239273002

Cr-Commit-Position: refs/heads/master@{#339629}

5 files changed, 0 insertions, 39 deletions

diff --git a/content/child/child_thread_impl.cc b/content/child/child_thread_impl.cc
index 8e674c9..03a9424 100644
--- a/content/child/child_thread_impl.cc
+++ b/content/child/child_thread_impl.cc
@@ -292,13 +292,6 @@ ChildThreadImpl::Options::Builder::AddStartupFilter(
   return *this;
 }
 
-ChildThreadImpl::Options::Builder&
-ChildThreadImpl::Options::Builder::ListenerTaskRunner(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
-  options_.listener_task_runner = task_runner;
-  return *this;
-}
-
 ChildThreadImpl::Options ChildThreadImpl::Options::Builder::Build() {
   return options_;
 }
@@ -442,10 +435,6 @@ void ChildThreadImpl::Init(const Options& options) {
     channel_->AddFilter(startup_filter);
   }
 
-  // Set listener task runner before connect channel to avoid data race.
-  if (options.listener_task_runner) {
-    channel_->SetListenerTaskRunner(options.listener_task_runner);
-  }
   ConnectChannel(options.use_mojo_channel);
 
   int connection_timeout = kConnectionTimeoutS;
diff --git a/content/child/child_thread_impl.h b/content/child/child_thread_impl.h
index 3330c99..f32ade7 100644
--- a/content/child/child_thread_impl.h
+++ b/content/child/child_thread_impl.h
@@ -309,7 +309,6 @@ struct ChildThreadImpl::Options {
   bool use_mojo_channel;
   scoped_refptr<base::SequencedTaskRunner> browser_process_io_runner;
   std::vector<IPC::MessageFilter*> startup_filters;
-  scoped_refptr<base::SingleThreadTaskRunner> listener_task_runner;
 
  private:
   Options();
@@ -323,8 +322,6 @@ class ChildThreadImpl::Options::Builder {
   Builder& UseMojoChannel(bool use_mojo_channel);
   Builder& WithChannelName(const std::string& channel_name);
   Builder& AddStartupFilter(IPC::MessageFilter* filter);
-  Builder& ListenerTaskRunner(
-      scoped_refptr<base::SingleThreadTaskRunner> task_runner);
 
   Options Build();
 
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 3ccec4e..13652dc1 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -624,7 +624,6 @@ RenderThreadImpl::RenderThreadImpl(
     : ChildThreadImpl(Options::Builder()
                           .InBrowserProcess(params)
                           .UseMojoChannel(ShouldUseMojoChannel())
-                          .ListenerTaskRunner(scheduler->DefaultTaskRunner())
                           .Build()),
       renderer_scheduler_(scheduler.Pass()),
       raster_worker_pool_(new RasterWorkerPool()) {
@@ -638,7 +637,6 @@ RenderThreadImpl::RenderThreadImpl(
     scoped_ptr<scheduler::RendererScheduler> scheduler)
     : ChildThreadImpl(Options::Builder()
                           .UseMojoChannel(ShouldUseMojoChannel())
-                          .ListenerTaskRunner(scheduler->DefaultTaskRunner())
                           .Build()),
       renderer_scheduler_(scheduler.Pass()),
       main_message_loop_(main_message_loop.Pass()),
diff --git a/ipc/ipc_channel_proxy.cc b/ipc/ipc_channel_proxy.cc
index 269fd6a..e8e3d28 100644
--- a/ipc/ipc_channel_proxy.cc
+++ b/ipc/ipc_channel_proxy.cc
@@ -52,14 +52,6 @@ void ChannelProxy::Context::ClearIPCTaskRunner() {
   ipc_task_runner_ = NULL;
 }
 
-void ChannelProxy::Context::SetListenerTaskRunner(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
-  DCHECK(ipc_task_runner_.get() != task_runner.get());
-  DCHECK(listener_task_runner_->BelongsToCurrentThread());
-  DCHECK(task_runner->BelongsToCurrentThread());
-  listener_task_runner_ = task_runner;
-}
-
 void ChannelProxy::Context::CreateChannel(scoped_ptr<ChannelFactory> factory) {
   base::AutoLock l(channel_lifetime_lock_);
   DCHECK(!channel_);
@@ -484,13 +476,6 @@ void ChannelProxy::RemoveFilter(MessageFilter* filter) {
                             make_scoped_refptr(filter)));
 }
 
-void ChannelProxy::SetListenerTaskRunner(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
-  DCHECK(CalledOnValidThread());
-
-  context()->SetListenerTaskRunner(task_runner);
-}
-
 void ChannelProxy::ClearIPCTaskRunner() {
   DCHECK(CalledOnValidThread());
 
diff --git a/ipc/ipc_channel_proxy.h b/ipc/ipc_channel_proxy.h
index 73cb7e0..5d1402e 100644
--- a/ipc/ipc_channel_proxy.h
+++ b/ipc/ipc_channel_proxy.h
@@ -144,12 +144,6 @@ class IPC_EXPORT ChannelProxy : public Sender, public base::NonThreadSafe {
   }
 #endif
 
-  // Set the task runner on which dispatched messages are posted. Both the new
-  // task runner and the existing task runner must run on the same thread, and
-  // must belong to the calling thread.
-  void SetListenerTaskRunner(
-    scoped_refptr<base::SingleThreadTaskRunner> listener_task_runner);
-
   // Called to clear the pointer to the IPC task runner when it's going away.
   void ClearIPCTaskRunner();
 
@@ -180,8 +174,6 @@ class IPC_EXPORT ChannelProxy : public Sender, public base::NonThreadSafe {
     Context(Listener* listener,
             const scoped_refptr<base::SingleThreadTaskRunner>& ipc_thread);
     void ClearIPCTaskRunner();
-    void SetListenerTaskRunner(
-      scoped_refptr<base::SingleThreadTaskRunner> listener_task_runner);
     base::SingleThreadTaskRunner* ipc_task_runner() const {
       return ipc_task_runner_.get();
     }