cc: Remove the remaining using-directives of namespace cc.

cc/test/animation_test_common.cc

Index: cc/test/animation_test_common.cc
diff --git a/cc/test/animation_test_common.cc b/cc/test/animation_test_common.cc
index f7288186d8f31345d72f7de34e9c65fba04c9be2..1ee736fa9c1b2ae79c5abc342fc38bee9a8d7202 100644
--- a/cc/test/animation_test_common.cc
+++ b/cc/test/animation_test_common.cc
@@ -10,7 +10,14 @@
 #include "cc/layer_impl.h"
 #include <public/WebTransformOperations.h>
 
-using namespace cc;
+using cc::ActiveAnimation;
+using cc::AnimationCurve;
+using cc::EaseTimingFunction;
+using cc::FloatKeyframe;
+using cc::KeyframedFloatAnimationCurve;
+using cc::KeyframedTransformAnimationCurve;
+using cc::TimingFunction;
+using cc::TransformKeyframe;
 
 namespace {