cc/output: cleanup: Remove unnecessary #includes

cc/output/filter_operation.cc

 // 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.
 
 #include <algorithm>
 
 #include "base/values.h"
 #include "cc/base/math_util.h"
 #include "cc/output/filter_operation.h"
-#include "third_party/skia/include/core/SkMath.h"
 #include "ui/gfx/animation/tween.h"
 
 namespace cc {
 
 bool FilterOperation::operator==(const FilterOperation& other) const {
   if (type_ != other.type_)
     return false;
   if (type_ == COLOR_MATRIX)
     return !memcmp(matrix_, other.matrix_, sizeof(matrix_));
   if (type_ == DROP_SHADOW) {
@@ skipping 289 matching lines @@
           region_value->AppendInteger(it.rect().height());
         }
         value->Set("region", region_value.release());
       }
       break;
   }
   return value.PassAs<base::Value>();
 }
 
 }  // namespace cc