Cleanup: Remove unneeded forward declarations in webkit/plugins/.

webkit/plugins/ppapi/ppb_image_data_impl.h

 // Copyright (c) 2011 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 WEBKIT_PLUGINS_PPAPI_PPB_IMAGE_DATA_IMPL_H_
 #define WEBKIT_PLUGINS_PPAPI_PPB_IMAGE_DATA_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ppapi/c/ppb_image_data.h"
 #include "ppapi/shared_impl/image_data_impl.h"
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/thunk/ppb_image_data_api.h"
 #include "webkit/plugins/ppapi/plugin_delegate.h"
 
 namespace skia {
 class PlatformCanvas;
 }
 
-struct PPB_ImageDataTrusted;
 class SkBitmap;
 
 namespace webkit {
 namespace ppapi {
 
 class PPB_ImageData_Impl : public ::ppapi::Resource,
                            public ::ppapi::ImageDataImpl,
                            public ::ppapi::thunk::PPB_ImageData_API {
  public:
   // If you call this constructor, you must also call Init before use. Normally
@@ skipping 60 matching lines @@
 // state. You must check is_valid() to make sure the image was successfully
 // mapped before using it.
 //
 // Example:
 //   ImageDataAutoMapper mapper(image_data);
 //   if (!mapper.is_valid())
 //     return utter_failure;
 //   image_data->mapped_canvas()->blah();  // Guaranteed valid.
 class ImageDataAutoMapper {
  public:
-  ImageDataAutoMapper(PPB_ImageData_Impl* image_data)
+  explicit ImageDataAutoMapper(PPB_ImageData_Impl* image_data)
         : image_data_(image_data) {
     if (image_data_->is_mapped()) {
       is_valid_ = true;
       needs_unmap_ = false;
     } else {
       is_valid_ = needs_unmap_ = !!image_data_->Map();
     }
   }
 
   ~ImageDataAutoMapper() {
@@ skipping 10 matching lines @@
   bool is_valid_;
   bool needs_unmap_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageDataAutoMapper);
 };
 
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_PPB_IMAGE_DATA_IMPL_H_