Fixed a bug with URLFetcher where retrying the request would append the new response data to the old one.

BUG=None.
TEST=Unit-tests

Review URL: http://codereview.chromium.org/5322015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@67815 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed