Change FrameTree to return Frames instead of LocalFrames.

Source/core/editing/SpellChecker.cpp

Index: Source/core/editing/SpellChecker.cpp
diff --git a/Source/core/editing/SpellChecker.cpp b/Source/core/editing/SpellChecker.cpp
index 11a148a614d0f5f395a9536ecc5d3625d6d3a5de..367ef2d440964c83ce03cf258dbc2f0340f0ead1 100644
--- a/Source/core/editing/SpellChecker.cpp
+++ b/Source/core/editing/SpellChecker.cpp
@@ -103,8 +103,12 @@ void SpellChecker::toggleContinuousSpellChecking()
     spellCheckerClient().toggleContinuousSpellChecking();
     if (isContinuousSpellCheckingEnabled())
         return;
-    for (LocalFrame* frame = m_frame.page()->mainFrame(); frame && frame->document(); frame = frame->tree().traverseNext()) {
-        for (Node* node = &frame->document()->rootNode(); node; node = NodeTraversal::next(*node)) {
+    for (Frame* frame = m_frame.page()->mainFrame(); frame; frame = frame->tree().traverseNext()) {
+        if (!frame->isLocalFrame())
+            continue;
+        if (!toLocalFrame(frame)->document())
+            break;
+        for (Node* node = &toLocalFrame(frame)->document()->rootNode(); node; node = NodeTraversal::next(*node)) {
             node->setAlreadySpellChecked(false);
         }
     }