Shortened URLRequestContextGetter's lifetime, which was extended by DownloadManager.
Shortened URLRequestContextGetter's lifetime, which was extended by DownloadManager.

BUG=58726
TEST=None

Review URL: http://codereview.chromium.org/3697007

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@65417 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