cc: Remove forbidden using namespace directives.

cc/content_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/content_layer.h"
 
 #include "cc/bitmap_content_layer_updater.h"
 #include "cc/content_layer_client.h"
 #include "cc/rendering_stats.h"
 #include "cc/test/geometry_test_utils.h"
 #include "skia/ext/platform_canvas.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/rect_conversions.h"
 
-using namespace cc;
 using namespace WebKit;
 
+namespace cc {
 namespace {
 
 class MockContentLayerClient : public ContentLayerClient {
 public:
     explicit MockContentLayerClient(gfx::Rect opaqueLayerRect)
         : m_opaqueLayerRect(opaqueLayerRect)
     {
     }
 
     virtual void paintContents(SkCanvas*, const gfx::Rect&, gfx::RectF& opaque) OVERRIDE
@@ skipping 14 matching lines @@
     MockContentLayerClient client(opaqueRectInLayerSpace);
     scoped_refptr<BitmapContentLayerUpdater> updater = BitmapContentLayerUpdater::create(ContentLayerPainter::create(&client).PassAs<LayerPainter>());
 
     gfx::Rect resultingOpaqueRect;
     RenderingStats stats;
     updater->prepareToUpdate(contentRect, gfx::Size(256, 256), contentsScale, contentsScale, resultingOpaqueRect, stats);
 
     EXPECT_RECT_EQ(gfx::ToEnclosingRect(opaqueRectInContentSpace), resultingOpaqueRect);
 }
 
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc