Disable "Ok Google" hotwording in open source builds by default.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 9399c5d17afc3e1653eb003a77500c67e06ea284..6bd835250e87e5b887a4208e689831fa3527421a 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -416,8 +416,10 @@
       # Web speech is enabled by default. Set to 0 to disable.
       'enable_web_speech%': 1,
 
-      # 'Ok Google' hotwording is enabled by default. Set to 0 to disable.
-      'enable_hotwording%': 1,
+      # 'Ok Google' hotwording is disabled by default in open source builds. Set
+      # to 1 to enable. (This will download a closed-source NaCl module at
+      # startup.) Official builds have this enabled by default.
+      'enable_hotwording%': 0,
 
       # Notifications are compiled in by default. Set to 0 to disable.
       'notifications%' : 1,
@@ -834,6 +836,7 @@
 
         ['buildtype=="Official"', {
           'enable_prod_wallet_service%': 1,
+          'enable_hotwording%': 1,

[Anand Mistry (off Chromium), 2015/06/24 01:10:33]

You want branding=="Chrome", not buildtype. buildtype controls compiler
optimisations.

[Matt Giuca, 2015/06/24 01:41:54]

Done.

         }],
 
         ['OS=="android"', {