Make sure the last selection gets spell checked when focusing different frame.

Source/core/editing/Editor.h

Index: Source/core/editing/Editor.h
diff --git a/Source/core/editing/Editor.h b/Source/core/editing/Editor.h
index 60cd39882693cb25c41d6844828420e6ae501064..e29321417f109a788a06ed940d77951cdce89cf8 100644
--- a/Source/core/editing/Editor.h
+++ b/Source/core/editing/Editor.h
@@ -310,6 +310,9 @@ public:
     void respondToChangedSelection(const VisibleSelection& oldSelection, FrameSelection::SetSelectionOptions);
     bool shouldChangeSelection(const VisibleSelection& oldSelection, const VisibleSelection& newSelection, EAffinity, bool stillSelecting) const;
 
+    void spellCheckAfterBlur();
+    void spellCheckOldSelection(const VisibleSelection& oldSelection, const VisibleSelection& newAdjacentWords, const VisibleSelection& newSelectedSentence);
+
     bool markedTextMatchesAreHighlighted() const;
     void setMarkedTextMatchesAreHighlighted(bool);