Fix default focused button in dialogs

chrome/views/dialog_delegate.h

 // Copyright (c) 2006-2008 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_VIEWS_DIALOG_DELEGATE_H_
 #define CHROME_VIEWS_DIALOG_DELEGATE_H_
 
 #include "chrome/views/dialog_client_view.h"
 #include "chrome/views/window_delegate.h"
 
@@ skipping 45 matching lines @@
     return L"";
   }
 
   // Override this function if with a view which will be shown in the same
   // row as the OK and CANCEL buttons but flush to the left and extending
   // up to the buttons.
   virtual View* GetExtraView() { return NULL; }
 
   // Returns the default dialog button. This should not be a mask as only one
   // button should ever be the default button. Return DIALOGBUTTON_NONE if
-  // there is no default.
-  virtual int GetDefaultDialogButton() const {
-    return DIALOGBUTTON_OK;
-  }
+  // there is no default.  Default behavior is to return DIALOGBUTTON_OK or
+  // DIALOGBUTTON_CANCEL (in that order) if they are present, DIALOGBUTTON_NONE
+  // otherwise.
+  virtual int GetDefaultDialogButton() const;
 
   // Returns whether the specified dialog button is enabled.
   virtual bool IsDialogButtonEnabled(DialogButton button) const {
     return true;
   }
 
   // Returns whether the specified dialog button is visible.
   virtual bool IsDialogButtonVisible(DialogButton button) const {
     return true;
   }
@@ skipping 24 matching lines @@
 
   // A helper for accessing the DialogClientView object contained by this
   // delegate's Window.
   DialogClientView* GetDialogClientView() const;
 };
 
 }  // namespace views
 
 #endif  // #ifndef CHROME_VIEWS_DIALOG_DELEGATE_H_