cc: Remove forbidden using namespace directives.

cc/heads_up_display_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/heads_up_display_layer.h"
 #include "cc/layer.h"
 #include "cc/layer_tree_host.h"
 #include "cc/test/layer_tree_test_common.h"
 
-using namespace cc;
 using namespace WebKitTests;
 
+namespace cc {
 namespace {
 
 class HeadsUpDisplayTest : public ThreadedTest {
 protected:
     virtual void initializeSettings(LayerTreeSettings& settings) OVERRIDE
     {
         // Enable the HUD without requiring text.
         settings.showPropertyChangedRects = true;
     }
 };
@@ skipping 78 matching lines @@
     scoped_refptr<DrawsContentLayer> m_rootLayer1;
     scoped_refptr<DrawsContentLayer> m_rootLayer2;
     int m_numCommits;
 };
 
 TEST_F(HudWithRootLayerChange, runMultiThread)
 {
     runTest(true);
 }
 
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc