Oilpan: Remove guardRef and guardDeref from TreeScope.

Source/core/dom/DocumentMarkerController.cpp

Index: Source/core/dom/DocumentMarkerController.cpp
diff --git a/Source/core/dom/DocumentMarkerController.cpp b/Source/core/dom/DocumentMarkerController.cpp
index 1d855e8c2eaa7a52609ba878fe598e4b89d458ce..4284af42133cbb2f113a59cd0c290ec661b06153 100644
--- a/Source/core/dom/DocumentMarkerController.cpp
+++ b/Source/core/dom/DocumentMarkerController.cpp
@@ -360,6 +360,17 @@ void DocumentMarkerController::removeMarkers(Node* node, unsigned startOffset, i
         node->renderer()->repaint();
 }
 
+void DocumentMarkerController::clearWeakMembers(Visitor* visitor)

[haraken, 2014/04/24 04:18:43]

Shall we add a FIXME that MarkerMap should use a hash map of WeakMembers?

[Mads Ager (chromium), 2014/04/24 10:57:36]

Yes, done.

+{
+    Vector<const Node*> deadNodes;
+    for (MarkerMap::iterator it = m_markers.begin(); it != m_markers.end(); ++it) {
+        if (!visitor->isAlive(it->key))
+            deadNodes.append(it->key);
+    }
+    for (unsigned i = 0; i < deadNodes.size(); ++i)
+        removeMarkers(const_cast<Node*>(deadNodes[i]));
+}
+
 DocumentMarker* DocumentMarkerController::markerContainingPoint(const LayoutPoint& point, DocumentMarker::MarkerType markerType)
 {
     if (!possiblyHasMarkers(markerType))