Revert r159362 and r159466 - they broke android run-webkit-tests

r159362 - "Wait for content_shell to print #READY before starting tests." -
appears to cause a deadlock in run-webkit-tests on android, so we never
run any tests. I'm not yet sure why this is broken.

r159466 - "Handle content_shell failing to start on android as device going
offline." - has several problems, including not dealing properly with
the case where *all devices* are broken (instead of reporting that
we exited early, we act as if all the tests passed).

I'm reverting these changes for now until I can figure out what's wrong with
the first patch and the best ways to fix the second.

TBR=ojan@chromium.org
BUG=306313, 265088, 305040

Review URL: https://codereview.chromium.org/26539008

git-svn-id: svn://svn.chromium.org/blink/trunk@159522 bbb929c8-8fbe-4397-9dbb-9b2b20218538