Remove 'WebURLRequest::TargetType' from WebURLLoader.

Remove 'WebURLRequest::TargetType' from WebURLLoader.

'WebURLRequest::TargetType' has been dropped in Blink in favor of
'RequestContext' and 'FrameType', matching the Fetch specification's
changes, and allowing both more granularity in various Blink-side checks
and more clarity around the thing that caused a request, and the frame
that the request affects.

This CL should have zero practical effect, as it's simply hoisting the
translation work that 'WebURLRequest::setTargetType' is already doing
up into the content layer to bring us one step closer to removing the
concept entirely.

BUG=390497
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284639

[Mike West, 2014-07-21 16:16:18]

Brett, mind taking a look at this CL?

darin@/jochen@ FYI, since you're on all the other CLs. :)

-mike

[brettw, 2014-07-21 20:20:38]

lgtm

[Mike West, 2014-07-22 04:31:20]

The CQ bit was checked by mkwst@chromium.org

[commit-bot: I haz the power, 2014-07-22 04:32:01]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mkwst@chromium.org/409583002/1

[commit-bot: I haz the power, 2014-07-22 06:25:16]

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

[commit-bot: I haz the power, 2014-07-22 06:53:43]

Change committed as 284639