cc: Delete all the RendererCapabilities.

cc/output/renderer_capabilities_impl.h

-// Copyright 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CC_OUTPUT_RENDERER_CAPABILITIES_IMPL_H_
-#define CC_OUTPUT_RENDERER_CAPABILITIES_IMPL_H_
-
-#include "cc/output/renderer_capabilities.h"
-
-namespace cc {
-
-struct RendererCapabilitiesImpl {
-  RendererCapabilitiesImpl();
-  ~RendererCapabilitiesImpl();
-
-  // Capabilities copied to main thread.
-  ResourceFormat best_texture_format = RGBA_8888;
-  int max_texture_size = 0;
-
-  RendererCapabilities MainThreadCapabilities() const {
-    return RendererCapabilities(best_texture_format, max_texture_size);
-  }
-};
-
-}  // namespace cc
-
-#endif  // CC_OUTPUT_RENDERER_CAPABILITIES_IMPL_H_