Parameterize the Google Update appid at build time instead of hard coding it in the source.

Review URL: http://codereview.chromium.org/178011

git-svn-id: http://src.chromium.org/svn/trunk/src/build@25072 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -69,6 +69,9 @@
     # {'variables': {'library': 'shared_library'}}
     # to compile as shared by default
     'library%': 'static_library',
+    
+    # The Google Update appid.
+    'google_update_appid%': '{8A69D345-D564-463c-AFF1-A69D9E530F96}',
 
     # TODO(bradnelson): eliminate this when possible.
     # To allow local gyp files to prevent release.vsprops from being included.
@@ -763,4 +766,4 @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
-}
+}