Revert stubs that were added in r88040. We need proper interfaces around features that need to be compiled out, instead of adding stubs.

Review URL: http://codereview.chromium.org/7046052

git-svn-id: http://src.chromium.org/svn/trunk/src/build@88374 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -443,9 +443,6 @@
     # Point to ICU directory.
     'icu_src_dir': '../third_party/icu',
 
-    # Enable desktop notifications.
-    'enable_desktop_notifications%': 1,
-
     'conditions': [
       ['os_posix==1 and OS!="mac"', {
         # This will set gcc_version to XY if you are running gcc X.Y.*.