Merge 169602 "Add more checks to prevent crashes when accessing ..."

Source/core/frame/DOMWindow.cpp

Index: Source/core/frame/DOMWindow.cpp
===================================================================
--- Source/core/frame/DOMWindow.cpp	(revision 169809)
+++ Source/core/frame/DOMWindow.cpp	(working copy)
@@ -1217,7 +1217,7 @@
 
 const AtomicString& DOMWindow::name() const
 {
-    if (!m_frame)
+    if (!isCurrentlyDisplayedInFrame())
         return nullAtom;
 
     return m_frame->tree().name();
@@ -1225,10 +1225,11 @@
 
 void DOMWindow::setName(const AtomicString& name)
 {
-    if (!m_frame)
+    if (!isCurrentlyDisplayedInFrame())
         return;
 
     m_frame->tree().setName(name);
+    ASSERT(m_frame->loader().client());
     m_frame->loader().client()->didChangeName(name);
 }