mojo: Add proper implementation of DetachFromClient to OutputSurfaceMojo.
BUG=523411,525811
TBR=sky@chromium.org
TEST=mojo_runner --use-temporary-user-data-dir --enable-html-viewer-test-interface --use-x11-test-config --override-use-gl-with-osmesa-for-tests --gtest_filter=AXProviderTest.HelloWorld mojo:html_viewer_apptests
NOTRY=true
Review URL: https://codereview.chromium.org/1362243002
Cr-Commit-Position: refs/heads/master@{#350483}
CrOS-Libchrome-Original-Commit: 18167629b4bdc20e951b71e9c546ed0c1030090f
2 files changed