Flip proprietary codecs to false for Android chromium builds.

build/common.gypi

 # 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 815 matching lines @@
           'enable_print_preview%': 0,
           'enable_task_manager%':0,
           'video_hole%': 1,
         }],
 
         # Android and OSX have built-in spellcheckers that can be utilized.
         ['OS=="android" or OS=="mac"', {
           'use_browser_spellchecker%': 1,
         }],
 
-        # Android OS includes support for proprietary codecs regardless of
-        # building Chromium or Google Chrome. We also ship Google Chrome and
-        # Chromecast with proprietary codecs.
-        ['OS=="android" or branding=="Chrome" or chromecast==1', {
+        # Enables proprietary codecs and demuxers; e.g. H264, AAC, MP3, and MP4.
+        # We always build Google Chrome and Chromecast with proprietary codecs.
+        ['branding=="Chrome" or chromecast==1', {
           'proprietary_codecs%': 1,
         }, {
           'proprietary_codecs%': 0,
         }],
 
         # Enable autofill dialog when not on iOS.
         ['OS!="ios"', {
           'enable_autofill_dialog%': 1,
         }],
 
@@ skipping 5513 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }