cc: Remove forbidden using namespace directives.

cc/tiled_layer_unittest.cc

Index: cc/tiled_layer_unittest.cc
diff --git a/cc/tiled_layer_unittest.cc b/cc/tiled_layer_unittest.cc
index d9f93a72fdf5a8e220ce812f19b72e2c0b7c627d..e5e3348404ce87bde9590f73365a8f79f382f04f 100644
--- a/cc/tiled_layer_unittest.cc
+++ b/cc/tiled_layer_unittest.cc
@@ -22,10 +22,10 @@
 #include "ui/gfx/rect_conversions.h"
 #include <public/WebTransformationMatrix.h>
 
-using namespace cc;
 using namespace WebKitTests;
 using WebKit::WebTransformationMatrix;
 
+namespace cc {
 namespace {
 
 class TestOcclusionTracker : public OcclusionTracker {
@@ -1625,4 +1625,5 @@ TEST_F(TiledLayerTest, nonIntegerContentsScaleIsNotDistortedDuringInvalidation)
     EXPECT_RECT_EQ(layerRect, layer->trackingLayerPainter()->paintedRect());
 }
 
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc