Enable -Winconsistent-missing-override flag.

webrtc/modules/utility/include/mock/mock_process_thread.h

Index: webrtc/modules/utility/include/mock/mock_process_thread.h
diff --git a/webrtc/modules/utility/include/mock/mock_process_thread.h b/webrtc/modules/utility/include/mock/mock_process_thread.h
index 3d39307ba4ddd5838ccf28b6dd4ec9ab45391a49..621fcee818249bef6fdd221ca4f37d49c5b5ef0d 100644
--- a/webrtc/modules/utility/include/mock/mock_process_thread.h
+++ b/webrtc/modules/utility/include/mock/mock_process_thread.h
@@ -21,6 +21,10 @@ namespace webrtc {
 
 class MockProcessThread : public ProcessThread {
  public:
+  // TODO(nisse): Valid overrides commented out, because the gmock
+  // methods don't use any override declarations, and we want to avoid
+  // warnings from -Winconsistent-missing-override. See
+  // http://crbug.com/428099.
   MOCK_METHOD0(Start, void());
   MOCK_METHOD0(Stop, void());
   MOCK_METHOD1(WakeUp, void(Module* module));
@@ -31,7 +35,7 @@ class MockProcessThread : public ProcessThread {
   // MOCK_METHOD1 gets confused with mocking this method, so we work around it
   // by overriding the method from the interface and forwarding the call to a
   // mocked, simpler method.
-  void PostTask(std::unique_ptr<ProcessTask> task) override {
+  void PostTask(std::unique_ptr<ProcessTask> task) /* override */ {
     PostTask(task.get());
   }
 };