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

mojo/examples/surfaces_app/child_gl_impl.h

Index: mojo/examples/surfaces_app/child_gl_impl.h
diff --git a/mojo/examples/surfaces_app/child_gl_impl.h b/mojo/examples/surfaces_app/child_gl_impl.h
index 57a6b234a0f64b70c2f85355ab9d2af01cd0b702..4c73e00daafb9ce1f5073d3da455c5d63e54a153 100644
--- a/mojo/examples/surfaces_app/child_gl_impl.h
+++ b/mojo/examples/surfaces_app/child_gl_impl.h
@@ -6,6 +6,7 @@
 #define MOJO_EXAMPLES_SURFACES_APP_CHILD_GL_IMPL_H_
 
 #include "base/containers/hash_tables.h"
+#include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
@@ -39,14 +40,14 @@ class ChildGLImpl : public InterfaceImpl<Child>, public SurfaceClient {
   virtual ~ChildGLImpl();
 
   // SurfaceClient implementation
-  virtual void ReturnResources(Array<ReturnedResourcePtr> resources) OVERRIDE;
+  virtual void ReturnResources(Array<ReturnedResourcePtr> resources) override;
 
  private:
   // Child implementation.
   virtual void ProduceFrame(
       ColorPtr color,
       SizePtr size,
-      const mojo::Callback<void(SurfaceIdPtr id)>& callback) OVERRIDE;
+      const mojo::Callback<void(SurfaceIdPtr id)>& callback) override;
 
   void SurfaceConnectionCreated(SurfacePtr surface, uint32_t id_namespace);
   void AllocateSurface();