cc: Remove forbidden using namespace directives.

cc/float_quad_unittest.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 
 #include "cc/math_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/rect_f.h"
 #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.
 TEST(FloatQuadTest, IsRectilinearTest)
 {
     const int numRectilinear = 8;
     WebTransformationMatrix rectilinearTrans[numRectilinear];
     rectilinearTrans[1].rotate(90);
     rectilinearTrans[2].rotate(180);
     rectilinearTrans[3].rotate(270);
@@ skipping 25 matching lines @@
     nonRectilinearTrans[9].skewY(0.00001);
 
     for (int i = 0; i < numNonRectilinear; ++i) {
         bool clipped = false;
         gfx::QuadF quad = MathUtil::mapQuad(nonRectilinearTrans[i], gfx::QuadF(gfx::RectF(0.01010101f, 0.01010101f, 100.01010101f, 100.01010101f)), clipped);
         ASSERT_TRUE(!clipped);
         EXPECT_FALSE(quad.IsRectilinear());
     }
 }
 
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc