cc: Remove forbidden using namespace directives.

cc/software_renderer_unittest.cc

Index: cc/software_renderer_unittest.cc
diff --git a/cc/software_renderer_unittest.cc b/cc/software_renderer_unittest.cc
index e0fd5dd9a72dfe1c3ca637e460fdd47568e30b3c..66e16549c4dc0ef014a4f1d6f5103f1d505292ad 100644
--- a/cc/software_renderer_unittest.cc
+++ b/cc/software_renderer_unittest.cc
@@ -21,10 +21,10 @@
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using namespace cc;
 using namespace WebKit;
 using namespace WebKitTests;
 
+namespace cc {
 namespace {
 
 class SoftwareRendererTest : public testing::Test, public RendererClient {
@@ -150,4 +150,5 @@ TEST_F(SoftwareRendererTest, tileQuad)
     EXPECT_EQ(SK_ColorCYAN, pixels[outerPixels - outerSize.width() - 2]);
 }
 
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc