WKProcessClass should create a WebContext

https://bugs.webkit.org/show_bug.cgi?id=127449
<rdar://problem/15885582>

Reviewed by Dan Bernstein.

* Shared/Cocoa/APIObject.mm:
(API::Object::newObject):
* UIProcess/API/Cocoa/WKBrowsingContextController.h:
* UIProcess/API/Cocoa/WKBrowsingContextController.mm:
* UIProcess/API/Cocoa/WKProcessClass.mm:
(-[WKProcessClass initWithConfiguration:]):
(-[WKProcessClass dealloc]):
(-[WKProcessClass API::]):
* UIProcess/API/Cocoa/WKProcessClassInternal.h: Renamed from Source/WebKit2/UIProcess/API/Cocoa/WKProcessGroupInternal.h.
(WebKit::wrapper):
* UIProcess/API/Cocoa/WKProcessGroup.mm:
(-[WKProcessGroup initWithInjectedBundleURL:]):
* UIProcess/API/ios/WKContentView.mm:
(-[WKContentView _decidePolicyForGeolocationRequestFromOrigin:frame:request:]):
* WebKit2.xcodeproj/project.pbxproj:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@162562 268f45cc-cd09-0410-ab3c-d52691b4dbfc