Fix a data race found by ThreadSanitizer in LoadLog::Release().
Fix a data race found by ThreadSanitizer in LoadLog::Release().

The scoped_refptr's destructor was being called at the very end of the function scope.
This meant that worker_log->Release() was called *after* PostTask().
However since the posted task also called worker_log->Release() (but from a different thread) this was a race.

BUG=22272

Review URL: http://codereview.chromium.org/308005

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@29551 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