Make infobars ignore button clicks when closing.

chrome/browser/tab_contents/infobar.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 CHROME_BROWSER_TAB_CONTENTS_INFOBAR_H_
 #define CHROME_BROWSER_TAB_CONTENTS_INFOBAR_H_
 #pragma once
 
 #include <utility>
 
@@ skipping 61 matching lines @@
   int arrow_height() const { return arrow_height_; }
   int arrow_target_height() const { return arrow_target_height_; }
   int arrow_half_width() const { return arrow_half_width_; }
   int total_height() const { return arrow_height_ + bar_height_; }
 
  protected:
   // ui::AnimationDelegate:
   virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
 
   // Forwards a close request to our owner.
+  // NOTE: Subclasses should not call this if we're already unowned.
   void RemoveSelf();
 
   // Changes the target height of the main ("bar") portion of the infobar.
   void SetBarTargetHeight(int height);
 
   // Given a control with size |prefsize|, returns the centered y position
   // within us, taking into account animation so the control "slides in" (or
   // out) as we animate open and closed.
   int OffsetY(const gfx::Size& prefsize) const;
 
@@ skipping 41 matching lines @@
   int bar_target_height_;
 
   DISALLOW_COPY_AND_ASSIGN(InfoBar);
 };
 
 #elif defined(OS_MACOSX)
 #include "chrome/browser/ui/cocoa/infobars/infobar.h"
 #endif
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_INFOBAR_H_