Enable AutoResize for Constrained Web Dialogs for Mac.

chrome/browser/ui/webui/constrained_web_dialog_delegate_base.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 CHROME_BROWSER_UI_WEBUI_CONSTRAINED_WEB_DIALOG_DELEGATE_BASE_H_
 #define CHROME_BROWSER_UI_WEBUI_CONSTRAINED_WEB_DIALOG_DELEGATE_BASE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/ui/webui/constrained_web_dialog_ui.h"
 #include "ui/web_dialogs/web_dialog_ui.h"
@@ skipping 28 matching lines @@
   gfx::NativeWindow GetNativeDialog() override;
   gfx::Size GetMinimumSize() const override;
   gfx::Size GetMaximumSize() const override;
   gfx::Size GetPreferredSize() const override;
 
   // WebDialogWebContentsDelegate interface.
   void HandleKeyboardEvent(
       content::WebContents* source,
       const content::NativeWebKeyboardEvent& event) override;
 
+  // Resize the dialog to the given size.
+  virtual void ResizeToGivenSize(const gfx::Size size);
+
  private:
   scoped_ptr<ui::WebDialogDelegate> web_dialog_delegate_;
 
   // Holds the HTML to display in the constrained dialog.
   scoped_ptr<content::WebContents> web_contents_;
 
   // Was the dialog closed from WebUI (in which case |web_dialog_delegate_|'s
   // OnDialogClosed() method has already been called)?
   bool closed_via_webui_;
 
   // If true, release |web_contents_| on close instead of destroying it.
   bool release_contents_on_close_;
 
   scoped_ptr<WebDialogWebContentsDelegate> override_tab_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ConstrainedWebDialogDelegateBase);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CONSTRAINED_WEB_DIALOG_DELEGATE_BASE_H_