cc: Remove forbidden using namespace directives.

cc/float_quad_unittest.cc

Index: cc/float_quad_unittest.cc
diff --git a/cc/float_quad_unittest.cc b/cc/float_quad_unittest.cc
index bfc1d6a5100778134be9ec5131594e372944a923..3a1e329892c2085aa1e44ecfebb5ca9b75748d49 100644
--- a/cc/float_quad_unittest.cc
+++ b/cc/float_quad_unittest.cc
@@ -10,9 +10,9 @@
 #include "ui/gfx/quad_f.h"
 #include <public/WebTransformationMatrix.h>
 
-using namespace cc;
 using WebKit::WebTransformationMatrix;
 
+namespace cc {
 namespace {
 
 // TODO(danakj) Move this test to ui/gfx/ when we don't use WebTransformationMatrix.
@@ -58,4 +58,5 @@ TEST(FloatQuadTest, IsRectilinearTest)
     }
 }
 
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc