Avoid meta-refresh when back-button gets non-sdch content
The first page search from google will not be SDCH encoded, but will
trigger a background download of a dictionary for future use.
..but..
IF the user navigates forward from the search page, and then back, then
Chromium will fetch the content from cache after specifying in the URL
that a dictionary is now available. This new logic detects such a
situation where non-SDCH content is pulled from the cache, and avoids
the (slower and overly conservative) meta-refresh.
test=see bug for repro cases. Check about:histogram/SDCH for error codes.
bug=20457
r=kmixter
Review URL: http://codereview.chromium.org/518016
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@35318 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed
