cc: Unify namespaces for all test files

cc/test/pixel_test_utils.cc

 // Copyright (c) 2012 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 "cc/test/pixel_test_utils.h"
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/codec/png_codec.h"
 
 namespace cc {
-namespace test {
 
 bool WritePNGFile(const SkBitmap& bitmap, const FilePath& file_path) {
   std::vector<unsigned char> png_data;
   const bool discard_transparency = true;
   if (gfx::PNGCodec::EncodeBGRASkBitmap(bitmap,
                                         discard_transparency,
                                         &png_data) &&
       file_util::CreateDirectory(file_path.DirName())) {
     char* data = reinterpret_cast<char*>(&png_data[0]);
     int size = static_cast<int>(png_data.size());
@@ skipping 45 matching lines @@
   }
 
   if (diff_pixels_count != 0) {
     LOG(ERROR) << "Images differ by pixel count: " << diff_pixels_count;
     return false;
   }
 
   return true;
 }
 
-}  // namespace test
 }  // namespace cc
-