Robustness improvements on the X-Associated-Content header. If we get a header which doesn't look like it contains a  parseable URL, log an error and drop it (instead of inserting it into the pending_streams_ list).
Robustness improvements on the X-Associated-Content header.
If we get a header which doesn't look like it contains a 
parseable URL, log an error and drop it (instead of inserting
it into the pending_streams_ list).

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/420002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@32629 0039d316-1c4b-4281-b951-d872f2087c98

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