[Chromecast] Change chromecast_branding to public

chromecast/chromecast.gni

Index: chromecast/chromecast.gni
diff --git a/chromecast/chromecast.gni b/chromecast/chromecast.gni
index b6f7307bcce064e4d296e9163cf4b31dc1db7ca9..be5c3446b7627e35d8946c4dbb7b184ac3963b20 100644
--- a/chromecast/chromecast.gni
+++ b/chromecast/chromecast.gni
@@ -3,8 +3,10 @@
 # found in the LICENSE file.
 
 declare_args() {
-  # is_chromecast_chrome_branded is set to true for an official build
-  is_chromecast_chrome_branded = false
+  # chromecast_branding is used to link different binaries in different build.

[gunsch, 2015/07/29 18:15:08]

"used to link different binaries" isn't the most helpful. all the flags do that.

+  # Set it to "public" for Chromium build.
+  # TODO(slan): Make this variable consistent with the GYP build.
+  chromecast_branding = "public"
 
   use_playready = false
 }