Make WebNode::to<Type>() (and toConst) casts contain type asserts.

third_party/WebKit/Source/web/WebNode.cpp

Index: third_party/WebKit/Source/web/WebNode.cpp
diff --git a/third_party/WebKit/Source/web/WebNode.cpp b/third_party/WebKit/Source/web/WebNode.cpp
index 5dea2bc4f583e8ebe1f198936b26b4b0ce13809a..ba4cbbfa669e75367c9bd0b2c5a061be8225601f 100644
--- a/third_party/WebKit/Source/web/WebNode.cpp
+++ b/third_party/WebKit/Source/web/WebNode.cpp
@@ -131,11 +131,6 @@ bool WebNode::lessThan(const WebNode& n) const
     return m_private.get() < n.m_private.get();
 }
 
-WebNode::NodeType WebNode::nodeType() const
-{
-    return static_cast<NodeType>(m_private->nodeType());
-}
-
 WebNode WebNode::parentNode() const
 {
     return WebNode(const_cast<ContainerNode*>(m_private->parentNode()));
@@ -219,6 +214,11 @@ bool WebNode::isElementNode() const
     return m_private->isElementNode();
 }
 
+bool WebNode::isDocumentNode() const
+{
+    return m_private->isDocumentNode();
+}
+
 void WebNode::dispatchEvent(const WebDOMEvent& event)
 {
     if (!event.isNull())