[WK2] Remove some bad stuff from WebPageProxy

[WK2] Remove some bad stuff from WebPageProxy
https://bugs.webkit.org/show_bug.cgi?id=138896

Patch by Benjamin Poulain <bpoulain@apple.com> on 2014-11-24
Reviewed by Sam Weinig.

The state loadStateAtProcessExit does not seem to be used anywhere.

The state urlAtProcessExit only exists to forward the url from
WebPageProxy::resetStateAfterProcessExited() to the coordinated graphics code
WebView::processDidExit().

* UIProcess/CoordinatedGraphics/WebView.cpp:
(WebKit::WebView::processDidExit):
* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::WebPageProxy):
(WebKit::WebPageProxy::resetStateAfterProcessExited):
* UIProcess/WebPageProxy.h:
(WebKit::WebPageProxy::urlAtProcessExit): Deleted.
(WebKit::WebPageProxy::loadStateAtProcessExit): Deleted.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@176530 268f45cc-cd09-0410-ab3c-d52691b4dbfc