Change NOTREACHED for a LOG(WARNING) when we can't delete the cache. This should help the unit tests.
Change NOTREACHED for a LOG(WARNING) when we can't delete
the cache. This should help the unit tests.

BUG:38562
Review URL: http://codereview.chromium.org/1594002

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@43446 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