Merge 135740

Source/WebCore/page/Frame.cpp

Index: Source/WebCore/page/Frame.cpp
===================================================================
--- Source/WebCore/page/Frame.cpp	(revision 136273)
+++ Source/WebCore/page/Frame.cpp	(working copy)
@@ -669,8 +669,13 @@
 {
     if (m_doc)
         m_doc->dispatchVisibilityStateChangeEvent();
+
+    Vector<RefPtr<Frame> > childFrames;
     for (Frame* child = tree()->firstChild(); child; child = child->tree()->nextSibling())
-        child->dispatchVisibilityStateChangeEvent();
+        childFrames.append(child);
+
+    for (size_t i = 0; i < childFrames.size(); ++i)
+        childFrames[i]->dispatchVisibilityStateChangeEvent();
 }
 #endif