Release unique_ids_lock_ in Autofill PDM in case observers need to acquire it.
Release unique_ids_lock_ in Autofill PDM in case observers need to acquire it.

BUG=58426
TEST=none

Review URL: http://codereview.chromium.org/3549028

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@62049 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