https://bugs.webkit.org/show_bug.cgi?id=124060

Reviewed by Beth Dakin.

Implement -hash and -isEqual: and add -[WKWebProcessPlugInBrowserContextController handle].

* Shared/API/Cocoa/WKBrowsingContextHandle.mm:
(-[WKBrowsingContextHandle hash]):
(-[WKBrowsingContextHandle isEqual:]):
* Shared/API/Cocoa/WKRemoteObjectCoder.mm:
(decodeInvocation):
* WebProcess/InjectedBundle/API/mac/WKWebProcessPlugInBrowserContextController.mm:
(-[WKWebProcessPlugInBrowserContextController mainFrameDocument]):
(-[WKWebProcessPlugInBrowserContextController selectedRange]):
(-[WKWebProcessPlugInBrowserContextController handle]):
* WebProcess/InjectedBundle/API/mac/WKWebProcessPlugInBrowserContextControllerInternal.h:
* WebProcess/InjectedBundle/API/mac/WKWebProcessPlugInBrowserContextControllerPrivate.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158939 268f45cc-cd09-0410-ab3c-d52691b4dbfc