https://bugs.webkit.org/show_bug.cgi?id=86428

Reviewed by Hajime Morita.

Source/WebCore:

Since Node::shadowTreeRootNode() returns only ShadowRoot or 0 now, its return type should be ShadowRoot.
This patch changes the return type and adds include directive to build.

No new tests, no change in behavior.

* dom/Node.cpp:
(WebCore::Node::shadowAncestorNode):
(WebCore::Node::shadowTreeRootNode):
* dom/Node.h:
(WebCore):
(Node):
* dom/NodeRenderingContext.cpp:
(WebCore::NodeRenderingContext::NodeRenderingContext):
* dom/Range.cpp:
(WebCore::Range::shadowTreeRootNode):
* dom/Range.h:
(Range):
* editing/Editor.cpp:
* editing/TextIterator.cpp:
* editing/htmlediting.cpp:
* html/shadow/ContentSelectorQuery.cpp:
* html/shadow/HTMLContentElement.cpp:
(WebCore::HTMLContentElement::parseAttribute):
* html/shadow/InsertionPoint.cpp:
(WebCore::InsertionPoint::detach):
* page/EventHandler.cpp:

Source/WebKit/chromium:

Adds include directive to build.

* src/WebFrameImpl.cpp:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@117036 268f45cc-cd09-0410-ab3c-d52691b4dbfc