Fix seeking after redirect

Fix seeking after redirect

The data length was behing applied to the old UrlData instance instead of the new one after a redirect.
Not knowing the length disables seeking, this CL fixes that and adds a test to prevent the problem from
occuring again.

BUG=606965
Committed: https://crrev.com/1fed486149cdfb7ad37fe474e3ab78d62cab42db
Cr-Commit-Position: refs/heads/master@{#390498}

[hubbe, 2016-04-28 18:52:53]

hubbe@chromium.org changed reviewers:
+ watk@chromium.org

[watk, 2016-04-28 18:57:33]

lgtm

[hubbe, 2016-04-28 19:09:50]

The CQ bit was checked by hubbe@chromium.org

[commit-bot: I haz the power, 2016-04-28 19:10:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1932823002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1932823002/1

[commit-bot: I haz the power, 2016-04-28 21:59:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-30 17:21:49]

Patchset 1 (id:??) landed as
https://crrev.com/1fed486149cdfb7ad37fe474e3ab78d62cab42db
Cr-Commit-Position: refs/heads/master@{#390498}

[commit-bot: I haz the power, 2016-04-30 17:57:49]

Description was changed from

==========
Fix seeking after redirect

The data length was behing applied to the old UrlData instance instead of the
new one after a redirect.
Not knowing the length disables seeking, this CL fixes that and adds a test to
prevent the problem from
occuring again.

BUG=606965
==========

to

==========
Fix seeking after redirect

The data length was behing applied to the old UrlData instance instead of the
new one after a redirect.
Not knowing the length disables seeking, this CL fixes that and adds a test to
prevent the problem from
occuring again.

BUG=606965

Committed: https://crrev.com/1fed486149cdfb7ad37fe474e3ab78d62cab42db
Cr-Commit-Position: refs/heads/master@{#390498}
==========