Flip proprietary codecs to false for Android chromium builds.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index b1b14d10b16bcd34bac2c091571c36dfc98d321f..885e3251c4dad9218d98b2db946e647a85b06260 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -833,10 +833,9 @@
           '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,