Standardize usage of virtual/override/final specifiers in cc/.

The Google C++ style guide states:

  Explicitly annotate overrides of virtual functions or virtual
  destructors with an override or (less frequently) final specifier.
  Older (pre-C++11) code will use the virtual keyword as an inferior
  alternative annotation. For clarity, use exactly one of override,
  final, or virtual when declaring an override.

To better conform to these guidelines, the following constructs have
been rewritten:

- if a base class has a virtual destructor, then:
    virtual ~Foo();                   ->  ~Foo() override;
- virtual void Foo() override;        ->  void Foo() override;
- virtual void Foo() override final;  ->  void Foo() final;

This patch was automatically generated. The clang plugin can generate
fixit hints, which are suggested edits when it is 100% sure it knows how
to fix a problem. The hints from the clang plugin were applied to the
source tree using the tool in https://codereview.chromium.org/598073004.

Several formatting edits by clang-format were manually reverted, due to
mangling of some of the more complicate IPC macros.

BUG=417463

Review URL: https://codereview.chromium.org/818033004

Cr-Commit-Position: refs/heads/master@{#309520}

1 files changed, 4 insertions, 4 deletions

diff --git a/cc/trees/layer_tree_host_unittest_proxy.cc b/cc/trees/layer_tree_host_unittest_proxy.cc
index f27b553..3135103 100644
--- a/cc/trees/layer_tree_host_unittest_proxy.cc
+++ b/cc/trees/layer_tree_host_unittest_proxy.cc
@@ -28,7 +28,7 @@ namespace cc {
 class ProxyTest : public LayerTreeTest {
  protected:
   ProxyTest() {}
-  virtual ~ProxyTest() {}
+  ~ProxyTest() override {}
 
   void Run(bool threaded, bool impl_side_painting) {
     // We don't need to care about delegating mode.
@@ -67,7 +67,7 @@ class ProxyTestScheduledActionsBasic : public ProxyTest {
 
   ProxyTestScheduledActionsBasic() : action_phase_(0) {
   }
-  virtual ~ProxyTestScheduledActionsBasic() {}
+  ~ProxyTestScheduledActionsBasic() override {}
 
  private:
   int action_phase_;
@@ -80,7 +80,7 @@ PROXY_TEST_SCHEDULED_ACTION(ProxyTestScheduledActionsBasic);
 class ThreadProxyTest : public ProxyTest {
  protected:
   ThreadProxyTest() {}
-  virtual ~ThreadProxyTest() {}
+  ~ThreadProxyTest() override {}
 
   const ThreadProxy::MainThreadOnly& ThreadProxyMainOnly() const {
     DCHECK(proxy());
@@ -101,7 +101,7 @@ class ThreadProxyTest : public ProxyTest {
 class ThreadProxyTestSetNeedsCommit : public ThreadProxyTest {
  protected:
   ThreadProxyTestSetNeedsCommit() {}
-  virtual ~ThreadProxyTestSetNeedsCommit() {}
+  ~ThreadProxyTestSetNeedsCommit() override {}
 
   void BeginTest() override {
     EXPECT_FALSE(ThreadProxyMainOnly().commit_requested);