Merge web_request_api_utils back into web_request_api_helpers.

Merge utils back into helpers.

While moving web_request files, we created web_request_api_utils to allow moving the functionality
of web_request_api_helpers a bit at a time. Everything has
moved, so it's time to recombine.

BUG=352293
Committed: https://crrev.com/9236b5422b6e7e9b3b6ffc10f10e93c4ac43e9b5
Cr-Commit-Position: refs/heads/master@{#296473}

[wjmaclean, 2014-09-24 17:23:02]

wjmaclean@chromium.org changed reviewers:
+ rockot@chromium.org

[wjmaclean, 2014-09-24 17:23:39]

Ken, ready for another easy one? :-)

[Ken Rockot(use gerrit already), 2014-09-24 17:24:59]

lgtm

[wjmaclean, 2014-09-24 17:29:54]

The CQ bit was checked by wjmaclean@chromium.org

[commit-bot: I haz the power, 2014-09-24 17:30:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/601843002/1

[commit-bot: I haz the power, 2014-09-24 18:29:37]

Committed patchset #1 (id:1) as d8ef76611d5c1a27b2472a24fed2ae5387415190

[commit-bot: I haz the power, 2014-09-24 18:30:45]

Patchset 1 (id:??) landed as
https://crrev.com/9236b5422b6e7e9b3b6ffc10f10e93c4ac43e9b5
Cr-Commit-Position: refs/heads/master@{#296473}