Add some missing Skia includes

content/renderer/pepper/ppb_image_data_impl.h

 // Copyright (c) 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 CONTENT_RENDERER_PEPPER_PPB_IMAGE_DATA_IMPL_H_
 #define CONTENT_RENDERER_PEPPER_PPB_IMAGE_DATA_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/shared_memory.h"
 #include "content/common/content_export.h"
 #include "ppapi/c/ppb_image_data.h"
 #include "ppapi/shared_impl/ppb_image_data_shared.h"
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/thunk/ppb_image_data_api.h"
-#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkBitmap.h"
 
-class SkBitmap;
 class SkCanvas;
 class TransportDIB;
 
 namespace base {
 class SharedMemory;
 }
 
 namespace content {
 
 class CONTENT_EXPORT PPB_ImageData_Impl
@@ skipping 184 matching lines @@
   PPB_ImageData_Impl* image_data_;
   bool is_valid_;
   bool needs_unmap_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageDataAutoMapper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PPB_IMAGE_DATA_IMPL_H_