Drop 'WebURLRequest::setTargetType' from various content/renderer files.

'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

Review URL: https://codereview.chromium.org/392333004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285530 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed