Disable the http cache when fetching PAC scripts. Also adds an extra log statement for when response is non-200.

The cache is disabled to avoid problems when switching networks (wouldn't want to re-use cached response from old network after switching to new network). 

This is only a partial piece for 12293 (still needs to re-trigger auto-detect on network change).

BUG=12293

Review URL: http://codereview.chromium.org/118032

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17572 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed