Move url_request_failed_job to net/test/url_request/

Move url_request_failed_job to net/test/url_request/

This CL is a second CL to move mock URLRequestJob files
from content/test/net/ to net/test/url_request/. The first
CL is crrev.com/541743002. The reason for this refactoring
is that Cronet (go/cronet) will need to use url_request_failed_job
and url_request_mock_http_job for testing. It will be nice
if they can be in net/test, as Cronet wouldn't need to depend
on content.

BUG=

Committed: https://crrev.com/2906f15fe42775f8f29599a0d799a5cc9f800188
Cr-Commit-Position: refs/heads/master@{#294499}

[xunjieli, 2014-09-11 14:48:58]

xunjieli@chromium.org changed reviewers:
+ avi@chromium.org, mmenke@chromium.org, thestig@chromium.org

[xunjieli, 2014-09-11 14:48:59]

+mmenke for net/
+avi for content/
+thestig for chrome/

Hi mmenke, avi and thesig, I need owners approval. Could you take a look at my
CL? Thank you!

[Avi (use Gerrit), 2014-09-11 14:52:56]

content lgtm

[mmenke, 2014-09-11 15:02:47]

On 2014/09/11 14:52:56, Avi wrote:
> content lgtm

LGTM.

Helen:  Just FYI, you didn't need anyone for content (I'm a content/test/net
owner, and any committer can sign off on content_tests.gypi changes -
content/OWNERs has a "per-file *.gypi=*" line for that).

thestig:  The only chrome/ files here I don't own are
chrome/browser/errorpage_browsertest.cc and
chrome/browser/policy/policy_browsertest.cc.

[Lei Zhang, 2014-09-11 21:42:47]

The CQ bit was checked by thestig@chromium.org

[Lei Zhang, 2014-09-11 21:42:48]

lgtm

[commit-bot: I haz the power, 2014-09-11 22:24:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/567563002/20001

[commit-bot: I haz the power, 2014-09-12 00:11:50]

Committed patchset #2 (id:20001) as d24d436a874559d786cf68c347e88e95d9040d1a

[commit-bot: I haz the power, 2014-09-12 00:22:22]

Patchset 2 (id:??) landed as
https://crrev.com/2906f15fe42775f8f29599a0d799a5cc9f800188
Cr-Commit-Position: refs/heads/master@{#294499}