https://bugs.webkit.org/show_bug.cgi?id=124961

Reviewed by Dan Bernstein.

- Store the PageClientImpl in a std::unique_ptr.
- Remove the WKBrowsingContextController internal load delegate. Replace its use with
  a new PageClient function, didCommitLoadForMainFrame.
- Fix typo in the WKContentViewDelegate. contentViewdidCommitLoadForMainFrame -> contentViewDidCommitLoadForMainFrame.
- Add initializers for WKContentView and WKView that take WKContextRefs and WKPageGroupRefs to match the Mac WKView.
  These are needed for WebKitTestRunner.
- Require a WKProcessGroup (or WKContextRef) and a WKBrowsingContextGroup (or WKPageGroupRef).
- Stop caching the WKProcessGroup and WKBrowsingContextGroup on the WKContentView.
- Remove incorrect implementations of initWithCoder.
- Make WKContentView lazily create its WKBrowsingContextController wrapper.

* UIProcess/API/ios/PageClientImplIOS.h:
* UIProcess/API/ios/PageClientImplIOS.mm:
(WebKit::PageClientImpl::PageClientImpl):
(WebKit::PageClientImpl::didCommitLoadForMainFrame):
(WebKit::PageClientImpl::mainDocumentDidReceiveMobileDocType):
* UIProcess/API/ios/WKContentView.h:
* UIProcess/API/ios/WKContentView.mm:
(-[WKContentView initWithCoder:]):
(-[WKContentView initWithFrame:processGroup:browsingContextGroup:]):
(-[WKContentView browsingContextController]):
(-[WKContentView _commonInitializationWithContextRef:pageGroupRef:relatedToPage:]):
(-[WKContentView _didCommitLoadForMainFrame]):
(-[WKContentView _didReceiveMobileDocTypeForMainFrame]):
(-[WKContentView _didChangeViewportArguments:WebCore::]):
(-[WKContentView _decidePolicyForGeolocationRequestFromOrigin:frame:request:]):
(-[WKContentView _pageRef]):
(-[WKContentView initWithFrame:contextRef:pageGroupRef:]):
(-[WKContentView initWithFrame:contextRef:pageGroupRef:relatedToPage:]):
* UIProcess/API/ios/WKContentViewInternal.h:
* UIProcess/API/ios/WKContentViewPrivate.h: Added.
* UIProcess/API/ios/WKView.mm:
(-[WKView initWithFrame:processGroup:browsingContextGroup:]):
(-[WKView initWithFrame:processGroup:browsingContextGroup:relatedToView:]):
(-[WKView contentViewDidCommitLoadForMainFrame:]):
(-[WKView _commonInitializationWithContextRef:pageGroupRef:relatedToPage:]):
(-[WKView pageRef]):
(-[WKView initWithFrame:contextRef:pageGroupRef:]):
(-[WKView initWithFrame:contextRef:pageGroupRef:relatedToPage:]):
* UIProcess/API/mac/PageClientImpl.h:
* UIProcess/API/mac/PageClientImpl.mm:
(WebKit::PageClientImpl::didCommitLoadForMainFrame):
* UIProcess/API/mac/WKBrowsingContextController.mm:
(didCommitLoadForFrame):
* UIProcess/API/mac/WKBrowsingContextControllerInternal.h:
* UIProcess/API/mac/WKViewPrivate.h:
* UIProcess/PageClient.h:
* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::didCommitLoadForFrame):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@159859 268f45cc-cd09-0410-ab3c-d52691b4dbfc