cc: Remove forbidden using namespace directives.

cc/layer_unittest.cc

Index: cc/layer_unittest.cc
diff --git a/cc/layer_unittest.cc b/cc/layer_unittest.cc
index 6c14ccfa3ed04822502e1292de7159260e399620..ed103b3d0dabef21bb137b9298b3a06b7d9f0817 100644
--- a/cc/layer_unittest.cc
+++ b/cc/layer_unittest.cc
@@ -20,7 +20,6 @@
 #include "testing/gtest/include/gtest/gtest.h"
 #include <public/WebTransformationMatrix.h>
 
-using namespace cc;
 using namespace WebKitTests;
 using WebKit::WebTransformationMatrix;
 using ::testing::Mock;
@@ -34,6 +33,7 @@ using ::testing::AnyNumber;
         Mock::VerifyAndClearExpectations(m_layerTreeHost.get());                                      \
     } while (0)
 
+namespace cc {
 namespace {
 
 class MockLayerImplTreeHost : public LayerTreeHost {
@@ -797,5 +797,5 @@ TEST(LayerTestWithoutFixture, setBoundsTriggersSetNeedsRedrawAfterGettingNonEmpt
     EXPECT_TRUE(layer->needsDisplay());
 }
 
-
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc