[Chromium] WebKit::initialize should take a Platform* now that WebKitPlatformSupport is empty
https://bugs.webkit.org/show_bug.cgi?id=110605

Reviewed by Adam Barth.

Part of a larger refactoring series; see tracking bug 82948.

* public/WebKit.h:
(WebKit):
* src/WebKit.cpp:
(WebKit::initialize):
(WebKit::initializeWithoutV8):
(WebKit::webKitPlatformSupport):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@143846 268f45cc-cd09-0410-ab3c-d52691b4dbfc