Revert "Revert "Const-ify RefCountedThreadSafe::AddRef and Release.""

chrome_frame failed to compile last time. I needed to add a "mutable" to a
member variable in chrome_frame/metrics_service.cc.

Review URL: http://codereview.chromium.org/3971004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@63574 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 3 insertions, 3 deletions

diff --git a/ipc/ipc_channel_proxy.cc b/ipc/ipc_channel_proxy.cc
index feca4eb..dcc66aad 100644
--- a/ipc/ipc_channel_proxy.cc
+++ b/ipc/ipc_channel_proxy.cc
@@ -54,7 +54,7 @@ bool ChannelProxy::MessageFilter::OnMessageReceived(const Message& message) {
   return false;
 }
 
-void ChannelProxy::MessageFilter::OnDestruct() {
+void ChannelProxy::MessageFilter::OnDestruct() const {
   delete this;
 }
 
diff --git a/ipc/ipc_channel_proxy.h b/ipc/ipc_channel_proxy.h
index 1ce9986..53a39b4 100644
--- a/ipc/ipc_channel_proxy.h
+++ b/ipc/ipc_channel_proxy.h
@@ -87,11 +87,11 @@ class ChannelProxy : public Message::Sender {
     // Called when the message filter is about to be deleted.  This gives
     // derived classes the option of controlling which thread they're deleted
     // on etc.
-    virtual void OnDestruct();
+    virtual void OnDestruct() const;
   };
 
   struct MessageFilterTraits {
-    static void Destruct(MessageFilter* filter) {
+    static void Destruct(const MessageFilter* filter) {
       filter->OnDestruct();
     }
   };