cc: Remove forbidden using namespace directives.

cc/layer_tree_host_unittest.cc

 // Copyright 2011 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/layer_tree_host.h"
 
 #include "base/synchronization/lock.h"
 #include "cc/content_layer.h"
@@ skipping 11 matching lines @@
 #include "cc/timing_function.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "third_party/khronos/GLES2/gl2ext.h"
 #include "ui/gfx/point_conversions.h"
 #include "ui/gfx/size_conversions.h"
 #include "ui/gfx/vector2d_conversions.h"
 #include <public/WebLayerScrollClient.h>
 #include <public/WebSize.h>
 
-using namespace cc;
 using namespace WebKit;
 using namespace WebKitTests;
 
+namespace cc {
 namespace {
 
 class LayerTreeHostTest : public ThreadedTest { };
 
 // Shortlived layerTreeHosts shouldn't die.
 class LayerTreeHostTestShortlived1 : public LayerTreeHostTest {
 public:
     LayerTreeHostTestShortlived1() { }
 
     virtual void beginTest() OVERRIDE
@@ skipping 3171 matching lines @@
 private:
     int m_numCommitsDeferred;
     int m_numCompleteCommits;
 };
 
 TEST_F(LayerTreeHostTestDeferCommits, runMultiThread)
 {
     runTest(true);
 }
 
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc