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
Review-Url: https://codereview.chromium.org/1932823002
Cr-Commit-Position: refs/heads/master@{#390498}
(cherry picked from commit 1fed486149cdfb7ad37fe474e3ab78d62cab42db)

Committed: https://chromium.googlesource.com/chromium/src/+/6ba2ce7dcaf9ed453405c542dadec634810e47c5

[hubbe, 2016-05-02 22:57:39]

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

Review-Url: https://codereview.chromium.org/1932823002
Cr-Commit-Position: refs/heads/master@{#390498}
(cherry picked from commit 1fed486149cdfb7ad37fe474e3ab78d62cab42db)
==========

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

Review-Url: https://codereview.chromium.org/1932823002
Cr-Commit-Position: refs/heads/master@{#390498}
(cherry picked from commit 1fed486149cdfb7ad37fe474e3ab78d62cab42db)

Committed:
https://chromium.googlesource.com/chromium/src/+/6ba2ce7dcaf9ed453405c542dade...
==========

[hubbe, 2016-05-02 22:57:41]

Committed patchset #1 (id:1) manually as
6ba2ce7dcaf9ed453405c542dadec634810e47c5 (tree was closed).