cc: Cleanup class/struct forward declarations

cc/output/filter_operation.h

 // Copyright 2013 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_FILTER_OPERATION_H_
 #define CC_OUTPUT_FILTER_OPERATION_H_
 
 #include <memory>
 
 #include "base/logging.h"
 #include "cc/base/cc_export.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkImageFilter.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "third_party/skia/include/core/SkScalar.h"
 #include "ui/gfx/geometry/point.h"
 
 namespace base {
 namespace trace_event {
 class TracedValue;
 }
-class Value;
 }
 
 namespace gfx {
 class Rect;
 }
 
 namespace cc {
 
 class CC_EXPORT FilterOperation {
  public:
@@ skipping 232 matching lines @@
   SkColor drop_shadow_color_;
   sk_sp<SkImageFilter> image_filter_;
   SkScalar matrix_[20];
   int zoom_inset_;
   SkRegion region_;
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_FILTER_OPERATION_H_