Rename buffer_types_traits.{cc,h} to match normal conventions.

ui/gfx/mojo/buffer_types_struct_traits.h

Index: ui/gfx/mojo/buffer_types_struct_traits.h
diff --git a/ui/gfx/mojo/buffer_types_traits.h b/ui/gfx/mojo/buffer_types_struct_traits.h
similarity index 98%
rename from ui/gfx/mojo/buffer_types_traits.h
rename to ui/gfx/mojo/buffer_types_struct_traits.h
index 086b27deb9078a69729df9448ec936916c2c4ec8..3716a61f4b849f5dbb66815214475faae462106f 100644
--- a/ui/gfx/mojo/buffer_types_traits.h
+++ b/ui/gfx/mojo/buffer_types_struct_traits.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef UI_GFX_MOJO_BUFFER_TYPES_TRAITS_H_
-#define UI_GFX_MOJO_BUFFER_TYPES_TRAITS_H_
+#ifndef UI_GFX_MOJO_BUFFER_TYPES_STRUCT_TRAITS_H_
+#define UI_GFX_MOJO_BUFFER_TYPES_STRUCT_TRAITS_H_
 
 #include "ui/gfx/buffer_types.h"
 #include "ui/gfx/mojo/buffer_types.mojom.h"
@@ -276,4 +276,4 @@ struct StructTraits<gfx::mojom::GpuMemoryBufferHandleDataView,
 
 }  // namespace mojo
 
-#endif  // UI_GFX_MOJO_BUFFER_TYPES_TRAITS_H_
+#endif  // UI_GFX_MOJO_BUFFER_TYPES_STRUCT_TRAITS_H_