Remove deprecated window.showModalDialog()

Source/core/frame/DOMWindow.h

Index: Source/core/frame/DOMWindow.h
diff --git a/Source/core/frame/DOMWindow.h b/Source/core/frame/DOMWindow.h
index b6b29303bbf15218d2e7f5f816128fd5898643c0..1fa485eb364f2d826c2bee699faf8de7d6d40f34 100644
--- a/Source/core/frame/DOMWindow.h
+++ b/Source/core/frame/DOMWindow.h
@@ -117,8 +117,6 @@ enum PageshowEventPersistence {
 
         bool allowPopUp(); // Call on first window, not target window.
         static bool allowPopUp(Frame* firstFrame);
-        static bool canShowModalDialog(const Frame*);
-        static bool canShowModalDialogNow(const Frame*);
 
         // DOM Level 0
 
@@ -150,10 +148,6 @@ enum PageshowEventPersistence {
         PassRefPtr<DOMWindow> open(const String& urlString, const AtomicString& frameName, const String& windowFeaturesString,
             DOMWindow* callingWindow, DOMWindow* enteredWindow);
 
-        typedef void (*PrepareDialogFunction)(DOMWindow*, void* context);
-        void showModalDialog(const String& urlString, const String& dialogFeaturesString,
-            DOMWindow* callingWindow, DOMWindow* enteredWindow, PrepareDialogFunction, void* functionContext);
-
         void alert(const String& message);
         bool confirm(const String& message);
         String prompt(const String& message, const String& defaultValue);