BUILD FIX (r150140): Frame::editor() should return a reference for iOS, too

* platform/ios/ClipboardIOS.mm:
(WebCore::ClipboardIOS::ClipboardIOS):
(WebCore::ClipboardIOS::hasData):
(WebCore::ClipboardIOS::clearData):
(WebCore::ClipboardIOS::clearAllData):
(WebCore::ClipboardIOS::getData):
(WebCore::ClipboardIOS::setData):
(WebCore::ClipboardIOS::types):
(WebCore::ClipboardIOS::writeRange):
* platform/ios/PasteboardIOS.mm:
(WebCore::Pasteboard::getStringSelection):
(WebCore::Pasteboard::writeSelection):
(WebCore::Pasteboard::writePlainText):
(WebCore::Pasteboard::writeImage):
(WebCore::Pasteboard::plainText):
(WebCore::documentFragmentWithRTF):
(WebCore::Pasteboard::documentFragmentForPasteboardItemAtIndex):
(WebCore::Pasteboard::documentFragment):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150166 268f45cc-cd09-0410-ab3c-d52691b4dbfc