Flip proprietary codecs to false for Android chromium builds.

build/config/features.gni

Index: build/config/features.gni
diff --git a/build/config/features.gni b/build/config/features.gni
index 8efa7cf3c5d32e4bd30b837324d01635dee76f87..8f0be39d0aee052244e7cb96be066fa91729cd83 100644
--- a/build/config/features.gni
+++ b/build/config/features.gni
@@ -47,10 +47,8 @@ declare_args() {
   enable_media_router = !is_ios
 
   # Enables proprietary codecs and demuxers; e.g. H264, MOV, AAC, and MP3.
-  # Android OS includes support for proprietary codecs regardless of building
-  # Chromium or Google Chrome. We also ship Google Chrome and Chromecast with
-  # proprietary codecs.
-  proprietary_codecs = is_android || is_chrome_branded || is_chromecast
+  # We always build Google Chrome and Chromecast with proprietary codecs.
+  proprietary_codecs = is_chrome_branded || is_chromecast
 
   enable_configuration_policy = !is_ios