ui: Remove unused DialogModel::GetDialogLabel().

ui/views/window/dialog_delegate.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_WINDOW_DIALOG_DELEGATE_H_
 #define UI_VIEWS_WINDOW_DIALOG_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/strings/string16.h"
 #include "ui/accessibility/ax_enums.h"
@@ skipping 65 matching lines @@
   virtual bool Accept();
 
   // Called when the user closes the window without selecting an option,
   // e.g. by pressing the close button on the window or using a window manager
   // gesture. By default, this calls Accept() if the only button in the dialog
   // is Accept, Cancel() otherwise. This function should return true if the
   // window can be closed after it returns, or false if it must remain open.
   virtual bool Close();
 
   // Overridden from ui::DialogModel:
-  base::string16 GetDialogLabel() const override;
   base::string16 GetDialogTitle() const override;
   int GetDialogButtons() const override;
   int GetDefaultDialogButton() const override;
   bool ShouldDefaultButtonBeBlue() const override;
   base::string16 GetDialogButtonLabel(ui::DialogButton button) const override;
   bool IsDialogButtonEnabled(ui::DialogButton button) const override;
 
   // Overridden from WidgetDelegate:
   View* GetInitiallyFocusedView() override;
   DialogDelegate* AsDialogDelegate() override;
@@ skipping 44 matching lines @@
   void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DialogDelegateView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WINDOW_DIALOG_DELEGATE_H_