Range::ownerDocument should return Document&

Range::ownerDocument should return Document&
https://bugs.webkit.org/show_bug.cgi?id=120908

Reviewed by Andreas Kling.

Source/WebCore:

Return Document& in Range::ownerDocument(). Also make setDocument take Document& so that this invariant is self-evident.

* bindings/objc/DOM.mm:
(-[DOMRange boundingBox]):
(-[DOMRange renderedImageForcingBlackText:]):
(-[DOMRange textRects]):
* dom/Range.cpp:
(WebCore::Range::setDocument):
(WebCore::Range::setStart):
(WebCore::Range::setEnd):
(WebCore::Range::selectNode):
(WebCore::Range::selectNodeContents):
* dom/Range.h:
(WebCore::Range::ownerDocument):
* editing/AlternativeTextController.cpp:
(WebCore::AlternativeTextController::handleAlternativeTextUIResult):
* editing/Editor.cpp:
(WebCore::Editor::avoidIntersectionWithDeleteButtonController):
(WebCore::isFrameInRange):
(WebCore::Editor::countMatchesForText):
* editing/EditorCommand.cpp:
(WebCore::unionDOMRanges):
* editing/TextCheckingHelper.cpp:
(WebCore::TextCheckingHelper::unifiedTextCheckerEnabled):
* editing/TextIterator.cpp:
(WebCore::plainText):
(WebCore::findPlainText):
* editing/htmlediting.cpp:
(WebCore::extendRangeToWrappingNodes):
* editing/markup.cpp:
(WebCore::createMarkup):
(WebCore::createFragmentFromText):
* page/DragController.cpp:
(WebCore::documentFragmentFromDragData):
(WebCore::DragController::concludeEditDrag):
* page/Page.cpp:
(WebCore::Page::rangeOfString):
* rendering/RenderObject.cpp:
(WebCore::RenderObject::absoluteBoundingBoxRectForRange):
* testing/Internals.cpp:
(WebCore::Internals::addTextMatchMarker):

Source/WebKit/blackberry:

* WebKitSupport/InPageSearchManager.cpp:
(BlackBerry::WebKit::InPageSearchManager::findNextString):
(BlackBerry::WebKit::InPageSearchManager::findAndMarkText):
(BlackBerry::WebKit::InPageSearchManager::clearTextMatches):
(BlackBerry::WebKit::InPageSearchManager::setActiveMatchAndMarker):
(BlackBerry::WebKit::InPageSearchManager::frameUnloaded):
(BlackBerry::WebKit::InPageSearchManager::scopeStringMatches):

Source/WebKit/mac:

* WebView/WebPDFView.mm:
(isFrameInRange):

Source/WebKit2:

* WebProcess/InjectedBundle/API/mac/WKDOMRange.mm:
(-[WKDOMRange textRects]):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@155228 268f45cc-cd09-0410-ab3c-d52691b4dbfc