cc: Remove forbidden using namespace directives.

cc/layer_iterator_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/layer_iterator.h"
 
 #include "cc/layer.h"
 #include "cc/layer_tree_host_common.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include <public/WebTransformationMatrix.h>
 
-using namespace cc;
 using WebKit::WebTransformationMatrix;
 using ::testing::Mock;
 using ::testing::_;
 using ::testing::AtLeast;
 using ::testing::AnyNumber;
 
+namespace cc {
 namespace {
 
 class TestLayer : public Layer {
 public:
     static scoped_refptr<TestLayer> create() { return make_scoped_refptr(new TestLayer()); }
 
     int m_countRepresentingTargetSurface;
     int m_countRepresentingContributingSurface;
     int m_countRepresentingItself;
 
@@ skipping 213 matching lines @@
     EXPECT_COUNT(root1, -1, -1, 12);
     EXPECT_COUNT(root2, 10, 11, -1);
     EXPECT_COUNT(root21, -1, -1, 9);
     EXPECT_COUNT(root22, 7, 8, 6);
     EXPECT_COUNT(root221, -1, -1, 5);
     EXPECT_COUNT(root23, 3, 4, 2);
     EXPECT_COUNT(root231, -1, -1, 1);
     EXPECT_COUNT(root3, -1, -1, 0);
 }
 
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc