cc: Get rid of the remaining includes to MathExtras.h.

cc/render_surface_filters.cc

 // Copyright 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.
 
 #include "config.h"
 
 #include "cc/render_surface_filters.h"
 
 #include "FloatSize.h"
 #include "base/logging.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/effects/SkBlurImageFilter.h"
 #include "third_party/skia/include/effects/SkColorMatrixFilter.h"
 #include "third_party/skia/include/effects/SkMagnifierImageFilter.h"
 #include "third_party/skia/include/gpu/SkGpuDevice.h"
 #include "third_party/skia/include/gpu/SkGrPixelRef.h"
 #include <public/WebFilterOperation.h>
 #include <public/WebFilterOperations.h>
 #include <public/WebGraphicsContext3D.h>
-#include <wtf/MathExtras.h>
 
-using namespace cc;
+namespace cc {
 
 namespace {
 
 void getBrightnessMatrix(float amount, SkScalar matrix[20])
 {
     memset(matrix, 0, 20 * sizeof(SkScalar));
     //    Old implementation, a la the draft spec, a straight-up scale,
     //    representing <feFunc[R|G|B] type="linear" slope="[amount]">
     //    (See http://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#brightnessEquivalent)
     // matrix[0] = matrix[6] = matrix[12] = amount;
@@ skipping 269 matching lines @@
     }
 
     GrContext* m_grContext;
     SkBitmap m_source;
     SkAutoTUnref<GrTexture> m_scratchTextures[2];
     int m_currentTexture;
     SkAutoTUnref<SkGpuDevice> m_device;
     SkAutoTUnref<SkCanvas> m_canvas;
 };
 
-}
-
-namespace cc {
+}  // namespace
 
 WebKit::WebFilterOperations RenderSurfaceFilters::optimize(const WebKit::WebFilterOperations& filters)
 {
     WebKit::WebFilterOperations newList;
 
     SkScalar accumulatedColorMatrix[20];
     bool haveAccumulatedColorMatrix = false;
     for (unsigned i = 0; i < filters.size(); ++i) {
         const WebKit::WebFilterOperation& op = filters.at(i);
 
@@ skipping 109 matching lines @@
         case WebKit::WebFilterOperation::FilterTypeOpacity:
             NOTREACHED();
             break;
         }
         state.swap();
     }
     context3D->flush();
     return state.source();
 }
 
-}
+}  // namespace cc