ui: Remove unused DialogModel::GetDialogLabel().

ui/base/models/dialog_model.h

 // Copyright (c) 2013 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_BASE_MODELS_DIALOG_MODEL_H_
 #define UI_BASE_MODELS_DIALOG_MODEL_H_
 
 #include "base/strings/string16.h"
 #include "ui/base/ui_base_export.h"
 #include "ui/base/ui_base_types.h"
 
 namespace ui {
 
 // A model representing a dialog window. The model provides the content to show
-// to the user (i.e. label, title), and the ways the user can interact with it
+// to the user (i.e. title), and the ways the user can interact with it
 // (i.e. the buttons).
 class UI_BASE_EXPORT DialogModel {
  public:
   virtual ~DialogModel();
 
-  // Returns the text of show in the dialog.
-  virtual base::string16 GetDialogLabel() const = 0;
-
   // Returns the title of the dialog.
   virtual base::string16 GetDialogTitle() const = 0;
 
   // Returns a mask specifying which of the available DialogButtons are visible
   // for the dialog. Note: Dialogs with just an OK button are frowned upon.
   virtual int GetDialogButtons() const = 0;
 
   // Returns the default dialog button. This should not be a mask as only
   // one button should ever be the default button.  Return
   // ui::DIALOG_BUTTON_NONE if there is no default.  Default
   // behavior is to return ui::DIALOG_BUTTON_OK or
   // ui::DIALOG_BUTTON_CANCEL (in that order) if they are
   // present, ui::DIALOG_BUTTON_NONE otherwise.
   virtual int GetDefaultDialogButton() const = 0;
 
   // Returns whether the default dialog button should be colored blue as a call
   // to action.
   virtual bool ShouldDefaultButtonBeBlue() const = 0;
 
   // Returns the label of the specified dialog button.
   virtual base::string16 GetDialogButtonLabel(DialogButton button) const = 0;
 
   // Returns whether the specified dialog button is enabled.
   virtual bool IsDialogButtonEnabled(DialogButton button) const = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_MODELS_DIALOG_MODEL_H_