Avoid creating a browser which is never shown in:
- AppListViewDelegate::OpenFeedback()
- SystemTrayDelegate::ShowHelp()

BUG=177542
TEST=None

Review URL: https://codereview.chromium.org/43123002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231408 0039d316-1c4b-4281-b951-d872f2087c98
Add unit tests for projection touch HUD

Existing touch HUD unit tests only test debug touch HUD. Here, a few
unit tests are added for projection touch HUD which needed some
refactoring in unit test classes.

BUG=311223

Review URL: https://codereview.chromium.org/44833002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231409 0039d316-1c4b-4281-b951-d872f2087c98
Clean up unused screen share resources.

The screen share tray item is using the IDR_AURA_UBER_TRAY_DISPLAY icon.

Review URL: https://codereview.chromium.org/46483002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231410 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 231410