Set an empty HTTP origin header if needed in RenderFrame::willSendRequest

Set an empty HTTP origin header if needed in RenderFrame::willSendRequest

This CL sets an empty HTTP origin header if needed in
RenderFrame::willSendRequest. This is currently done in
FrameFetchContext::addAdditionalRequestHeaders and should go away.

BUG=376025
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=280802

[clamy, 2014-06-26 15:39:20]

@jam, ppi: PTAL

[ppi, 2014-06-26 15:59:18]

lgtm, thanks!

[jam, 2014-06-26 19:26:46]

lgtm

[clamy, 2014-06-30 10:17:22]

The CQ bit was checked by clamy@chromium.org

[commit-bot: I haz the power, 2014-06-30 10:17:35]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/clamy@chromium.org/343273005/1

[commit-bot: I haz the power, 2014-06-30 11:59:03]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_chromium_chromeos_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_chrome...)

[commit-bot: I haz the power, 2014-06-30 13:57:04]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-06-30 13:57:05]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_chrome...)

[ppi, 2014-06-30 14:00:51]

The CQ bit was checked by ppi@chromium.org

[commit-bot: I haz the power, 2014-06-30 14:02:20]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/clamy@chromium.org/343273005/1

[ppi, 2014-06-30 14:02:28]

The CQ bit was unchecked by ppi@chromium.org

[clamy, 2014-07-01 11:55:21]

The CQ bit was checked by clamy@chromium.org

[commit-bot: I haz the power, 2014-07-01 11:55:41]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/clamy@chromium.org/343273005/1

[commit-bot: I haz the power, 2014-07-01 11:56:51]

Change committed as 280802