cc: Remove forbidden using namespace directives.

cc/tiled_layer_impl_unittest.cc

Index: cc/tiled_layer_impl_unittest.cc
diff --git a/cc/tiled_layer_impl_unittest.cc b/cc/tiled_layer_impl_unittest.cc
index 323ce891bde9e3032d95f96ca29a9da976b6554e..16775d8c43052b66a02ed6919f8edbc588ab0bc4 100644
--- a/cc/tiled_layer_impl_unittest.cc
+++ b/cc/tiled_layer_impl_unittest.cc
@@ -15,9 +15,9 @@
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using namespace cc;
 using namespace LayerTestCommon;
 
+namespace cc {
 namespace {
 
 // Create a default tiled layer with textures for all tiles and a default
@@ -227,4 +227,5 @@ TEST(TiledLayerImplTest, tileOpaqueRectForLayerNoBorders)
     }
 }
 
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc