Remove V8DOMWindowShell::setLocation

Remove V8DOMWindowShell::setLocation
https://bugs.webkit.org/show_bug.cgi?id=83833

Reviewed by Eric Seidel.

V8DOMWindowShell::setLocation is only used by document.location.  It's
more direct for document.location to call Location::setHref directly.
This integrates correctly with the navigation rules for
<iframe seamless>.

(See https://github.com/eseidel/webkit/compare/master...seamless for
more context about the connection with seamless.)

Reviewed on GitHub:
https://github.com/abarth/webkit/commit/48601729d53a6ac39df5a43b22218c91330c3f61

* bindings/v8/V8DOMWindowShell.cpp:
(WebCore):
* bindings/v8/V8DOMWindowShell.h:
(V8DOMWindowShell):
* bindings/v8/custom/V8DocumentLocationCustom.cpp:
(WebCore::V8Document::locationAccessorSetter):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114080 268f45cc-cd09-0410-ab3c-d52691b4dbfc