Fix display_utilities.take_screenshot_crop()

Need to add 'return True' for xmlrpc call to work.

BUG=chromium:423527
TEST=run display_HotPlugNoisy.extended and see it passed.

Change-Id: If4943c3e05494a9086b9cdedaaba715ff07553e4
Reviewed-on: https://chromium-review.googlesource.com/223680
Tested-by: Hung-ying Tyan <tyanh@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@chromium.org>
Commit-Queue: Wai-Hong Tam <waihong@chromium.org>
1 file changed