Cleanup: Move code common in ChromeClient JavaScript dialog functions to a function template.

Source/core/loader/EmptyClients.h

Index: Source/core/loader/EmptyClients.h
diff --git a/Source/core/loader/EmptyClients.h b/Source/core/loader/EmptyClients.h
index 1f86da1293445df8d0ba503c99c8a85d4776a9f8..dbb250f0fdd2532d11e503e52f42b188f2114535 100644
--- a/Source/core/loader/EmptyClients.h
+++ b/Source/core/loader/EmptyClients.h
@@ -103,7 +103,7 @@ public:
     virtual void addMessageToConsole(LocalFrame*, MessageSource, MessageLevel, const String&, unsigned, const String&, const String&) override { }
 
     virtual bool canRunBeforeUnloadConfirmPanel() override { return false; }
-    virtual bool runBeforeUnloadConfirmPanelInternal(const String&, LocalFrame*) override { return true; }
+    virtual bool runBeforeUnloadConfirmPanelInternal(LocalFrame*, const String&) override { return true; }
 
     virtual void closeWindowSoon() override { }