Fix Mojo's WebURLLoader so that it provides protocol version and headers.

Fix Mojo's WebURLLoader so that it provides protocol version and headers.

media::BufferedResourceLoader needs HTTP protocol and header information
in the HTTP responses so that it can properly detect live streams and
whether Range: headers are supported. This patch provides the missing
functionality needed by the media code.

Committed: https://crrev.com/e085729078c2cb3b0c78e71c6e25d5ebd59c3963
Cr-Commit-Position: refs/heads/master@{#294304}

[acolwell GONE FROM CHROMIUM, 2014-09-11 01:15:30]

acolwell@chromium.org changed reviewers:
+ darin@chromium.org

[darin (slow to review), 2014-09-11 01:33:58]

lgtm

[darin (slow to review), 2014-09-11 02:22:29]

The CQ bit was checked by darin@chromium.org

[commit-bot: I haz the power, 2014-09-11 02:25:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/566453002/1

[commit-bot: I haz the power, 2014-09-11 02:53:56]

Committed patchset #1 (id:1) as 27c0f792b31f8d9ab3f274eb0f7824c87a8e75d4

[commit-bot: I haz the power, 2014-09-11 03:09:30]

Patchset 1 (id:??) landed as
https://crrev.com/e085729078c2cb3b0c78e71c6e25d5ebd59c3963
Cr-Commit-Position: refs/heads/master@{#294304}