IDMap derives from NonThreadSafe.
IDMap derives from NonThreadSafe.

During a code review I noticed that RenderViewHost::FromID was being called from the IO thread, but there were no automated assertions that fired.

BUG=None
TEST=DCHECK fires when I add bad code. Otherwise Chrome works without crashing in Debug build.

Review URL: http://codereview.chromium.org/6591108

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@77232 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser