cc: Remove forbidden using namespace directives.

cc/layer_sorter_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_sorter.h"
 
 #include "cc/layer_impl.h"
 #include "cc/math_util.h"
 #include "cc/single_thread_proxy.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include <public/WebTransformationMatrix.h>
 
-using namespace cc;
 using WebKit::WebTransformationMatrix;
 
+namespace cc {
 namespace {
 
 // Note: In the following overlap tests, the "camera" is looking down the negative Z axis,
 // meaning that layers with smaller z values (more negative) are further from the camera
 // and therefore must be drawn before layers with higher z values.
 
 TEST(LayerSorterTest, BasicOverlap)
 {
     LayerSorter::ABCompareResult overlapResult;
     const float zThreshold = 0.1f;
@@ skipping 227 matching lines @@
     layerSorter.sort(layerList.begin(), layerList.end());
 
     ASSERT_EQ(static_cast<size_t>(5), layerList.size());
     EXPECT_EQ(3, layerList[0]->id());
     EXPECT_EQ(4, layerList[1]->id());
     EXPECT_EQ(1, layerList[2]->id());
     EXPECT_EQ(2, layerList[3]->id());
     EXPECT_EQ(5, layerList[4]->id());
 }
 
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc