cc: Remove forbidden using namespace directives.

cc/tree_synchronizer_unittest.cc

Index: cc/tree_synchronizer_unittest.cc
diff --git a/cc/tree_synchronizer_unittest.cc b/cc/tree_synchronizer_unittest.cc
index 8f3585c37cdd546d0ea89cfd0140aa3d69791d5c..0abea1af3869674c8a84df23bbaa7488219effb8 100644
--- a/cc/tree_synchronizer_unittest.cc
+++ b/cc/tree_synchronizer_unittest.cc
@@ -17,9 +17,9 @@
 #include "cc/test/fake_proxy.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using namespace cc;
 using namespace WebKitTests;
 
+namespace cc {
 namespace {
 
 class MockLayerImpl : public LayerImpl {
@@ -407,4 +407,5 @@ TEST(TreeSynchronizerTest, synchronizeAnimations)
     EXPECT_TRUE(static_cast<FakeLayerAnimationController*>(layerTreeRoot->layerAnimationController())->synchronizedAnimations());
 }
 
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc