Add content_common dependency to app_shim target

This is necessary because extension_app_shim_handler_mac.cc includes
public/web/WebNotificationPresenter.h indirectly.

BUG=350097

Review URL: https://codereview.chromium.org/391283002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283496 0039d316-1c4b-4281-b951-d872f2087c98

apps/app_shim/app_shim.gypi

@@ -11,6 +11,7 @@
       # on browser here.
       'dependencies': [
         '../chrome/chrome_resources.gyp:chrome_strings',
+        '../content/content.gyp:content_common',
         '../skia/skia.gyp:skia',
       ],
       'include_dirs': [