Define proprietary_codecs=1 when branding==Chrome.

media/base/media_file_checker_unittest.cc

 // Copyright 2013 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 "base/logging.h"
 #include "build/build_config.h"
 #include "media/base/media_file_checker.h"
 #include "media/base/test_data_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 21 matching lines @@
 }
 
 TEST(MediaFileCheckerTest, Video) {
   RunMediaFileChecker("bear.ogv", true);
 }
 
 TEST(MediaFileCheckerTest, Audio) {
   RunMediaFileChecker("sfx.ogg", true);
 }
 
-#if defined(GOOGLE_CHROME_BUILD) || defined(USE_PROPRIETARY_CODECS)
+#if defined(USE_PROPRIETARY_CODECS)
 TEST(MediaFileCheckerTest, MP3) {
   RunMediaFileChecker("sfx.mp3", true);
 }
 #endif
 
 }  // namespace media