Expose the WKView SPI, _prepareForMoveToWindow:withCompletionHandler as WKWebView SPI
<rdar://problem/31350588>
Created attachment 305930 [details] Patch
Comment on attachment 305930 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=305930&action=review > Source/WebKit2/UIProcess/API/Cocoa/WKWebView.mm:5033 > + auto copiedCompletionHandler = Block_copy(completionHandler); Should this use makeBlockPtr?
Committed r214643: <http://trac.webkit.org/changeset/214643>