Standardize usage of virtual/override/final in ipc/

ipc/mojo/ipc_channel_mojo.cc

Index: ipc/mojo/ipc_channel_mojo.cc
diff --git a/ipc/mojo/ipc_channel_mojo.cc b/ipc/mojo/ipc_channel_mojo.cc
index a5663411e5ca0f77a1f303b2f96e15c2e2db968f..bd3ceb58cf8185f9fe3b145c699f9c3c72e42d4b 100644
--- a/ipc/mojo/ipc_channel_mojo.cc
+++ b/ipc/mojo/ipc_channel_mojo.cc
@@ -27,11 +27,11 @@ class MojoChannelFactory : public ChannelFactory {
                      Channel::Mode mode)
       : delegate_(delegate), channel_handle_(channel_handle), mode_(mode) {}
 
-  virtual std::string GetName() const override {
+  std::string GetName() const override {
     return channel_handle_.name;
   }
 
-  virtual scoped_ptr<Channel> BuildChannel(Listener* listener) override {
+  scoped_ptr<Channel> BuildChannel(Listener* listener) override {
     return ChannelMojo::Create(delegate_, channel_handle_, mode_, listener);
   }