Revert 255302 "Updating Mac buildbots to run gcm_unit_tests"

Reason for revert: tests not stable on mac despite revert, need to reopen tree.
We can reenable once we figure out whats going on.  

> Updating Mac buildbots to run gcm_unit_tests
> 
> BUG=341513
> 
> Review URL: https://codereview.chromium.org/185943008

TBR=fgorski@chromium.org

Review URL: https://codereview.chromium.org/228023002

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@262286 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
Adding gcm_unit_tests to trybots

BUG=341513

Review URL: https://codereview.chromium.org/227083008

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@262453 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
Run device_unittests on trybots

BUG=none
R=armansito@chromium.org

Review URL: https://codereview.chromium.org/227123003

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@262693 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
Add app_list_unittests to chromium_trybot tests

BUG=356044
R=stevenjb@chromium.org

Review URL: https://codereview.chromium.org/228713002

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@262694 4ff67af0-8c30-449e-8e8b-ad334ec8d88c