Mojo: Convert the remaining OVERRIDEs to override in mojo/.

mojo/services/gles2/mojo_buffer_backing.h

Index: mojo/services/gles2/mojo_buffer_backing.h
diff --git a/mojo/services/gles2/mojo_buffer_backing.h b/mojo/services/gles2/mojo_buffer_backing.h
index 4048b6cbff2c097f9899e365b12ff7bda450c68f..9304df7a7d0a61410267d43e22dae1b28cdbc9b8 100644
--- a/mojo/services/gles2/mojo_buffer_backing.h
+++ b/mojo/services/gles2/mojo_buffer_backing.h
@@ -5,6 +5,7 @@
 #ifndef MOJO_SERVICES_GLES2_MOJO_BUFFER_BACKING_H_
 #define MOJO_SERVICES_GLES2_MOJO_BUFFER_BACKING_H_
 
+#include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "gpu/command_buffer/common/buffer.h"
 #include "mojo/public/cpp/system/core.h"
@@ -23,8 +24,8 @@ class MojoBufferBacking : public gpu::BufferBacking {
       mojo::ScopedSharedBufferHandle handle,
       size_t size);
 
-  virtual void* GetMemory() const OVERRIDE;
-  virtual size_t GetSize() const OVERRIDE;
+  virtual void* GetMemory() const override;
+  virtual size_t GetSize() const override;
 
  private:
   mojo::ScopedSharedBufferHandle handle_;