cc: Remove forbidden using namespace directives.

cc/contents_scaling_layer_unittest.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/contents_scaling_layer.h"
 
 #include "cc/test/geometry_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using namespace cc;
-
+namespace cc {
 namespace {
 
 class MockContentsScalingLayer : public ContentsScalingLayer {
  public:
   MockContentsScalingLayer()
       : ContentsScalingLayer() {
   }
 
   virtual void setNeedsDisplayRect(const gfx::RectF& dirtyRect) OVERRIDE {
     m_lastNeedsDisplayRect = dirtyRect;
@@ skipping 46 matching lines @@
 
   testLayer->resetNeedsDisplay();
   EXPECT_FALSE(testLayer->needsDisplay());
 
   testLayer->setContentsScale(testLayer->contentsScaleX() + 1.f);
   EXPECT_TRUE(testLayer->needsDisplay());
   EXPECT_FLOAT_RECT_EQ(gfx::RectF(0, 0, 320, 240),
                        testLayer->lastNeedsDisplayRect());
 }
 
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc