Fix grammatical errors in comments in ui/views

ui/views/window/dialog_delegate.h

 // Copyright (c) 2011 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_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "base/string16.h"
@@ skipping 50 matching lines @@
   // when an accelerator is pressed, not at construction time. This
   // returns true.
   virtual bool AreAcceleratorsEnabled(ui::DialogButton button);
 
   // 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();
 
   // Returns whether the height of the extra view should be at least as tall as
-  // the buttons. The default (false) is to give the extra view it's preferred
+  // the buttons. The default (false) is to give the extra view its preferred
   // height. By returning true the height becomes
   // max(extra_view preferred height, buttons preferred height).
   virtual bool GetSizeExtraViewHeightToButtons();
 
   // For Dialog boxes, if there is a "Cancel" button, this is called when the
   // user presses the "Cancel" button or the Close button on the window or
   // in the system menu, or presses the Esc key. This function should return
   // true if the window can be closed after it returns, or false if it must
   // remain open.
   virtual bool Cancel();
@@ skipping 38 matching lines @@
   virtual Widget* GetWidget() OVERRIDE;
   virtual const Widget* GetWidget() const OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DialogDelegateView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WINDOW_DIALOG_DELEGATE_H_