cc: Cleanup class/struct forward declarations

cc/output/filter_operations.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_OPERATIONS_H_
 #define CC_OUTPUT_FILTER_OPERATIONS_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/logging.h"
 #include "cc/output/filter_operation.h"
 
 namespace base {
 namespace trace_event {
 class TracedValue;
 }
-class Value;
 }
 
 namespace gfx {
 class Rect;
 }
 
 namespace cc {
 
 // An ordered list of filter operations.
 class CC_EXPORT FilterOperations {
@@ skipping 61 matching lines @@
 
   void AsValueInto(base::trace_event::TracedValue* value) const;
 
  private:
   std::vector<FilterOperation> operations_;
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_FILTER_OPERATIONS_H_