Cleanup old code in wallpaperPrivate API

This CL removes source parameter from chrome.wallpaperPrivate.getOfflineList
and chrome.wallpaperPrivate.setWallpaperIfExists. The CUSTOM source are no longer
being used in the wallpaper picker app.

BUG=None

Review URL: https://codereview.chromium.org/27525003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229615 0039d316-1c4b-4281-b951-d872f2087c98
Basic browser test for Feedback.
Adds a basic browser test for feedback that sends the feedback requested event and verifies that the UI comes up.

R=asargent@chromium.org
BUG=263582

Review URL: https://codereview.chromium.org/27623003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229616 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229616
dbus: Remove mock_gsm_sms_client.h/cc

These files are no longer in use.

BUG=234498
TEST=none

Review URL: https://codereview.chromium.org/27652003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229617 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229617