Always download google_play_services zip package instead of rsync.

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index 379f7ef7225b6f55bee00333ec422d03d6276b0f..f3b934f971d1609058d7b6b451d4c1105ba38f4b 100644
--- a/DEPS
+++ b/DEPS
@@ -558,9 +558,9 @@ hooks = [
     # need to manually install these packages and accept the ToS.
     'name': 'sdkextras',
     'pattern': '.',
-    # Make sure to add package to .gitignore in third_party/android_tools.
+    # Add package and zip file to .gitignore in third_party/android_tools.

[cjhopman, 2014/12/31 00:39:28]

What does this comment mean? Does this action add those things to .gitignore in
third_party/android_tools?

[navabi, 2015/01/06 00:32:09]

The comment is instructing the person that adds arguments to the call to
download_sdk_extras.py to update the .gitignore file according. 

[cjhopman, 2015/01/06 02:04:04]

Oh, that makes sense. Could you maybe add: "When changing this, make sure to..."
or some such.

     'action': ['python', 'src/build/download_sdk_extras.py',
-               'google_google_play_services_21.0.0'],
+               'google_google_play_services_21.0.0.zip'],
   },
   {
     # Downloads the Debian Wheezy sysroot to chrome/installer/linux if needed.