Make TabContents own its infobar delegates....

chrome/browser/ui/views/infobars/translate_infobar_base.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/browser/views/infobars/translate_infobar_base.h"
 
 #include "app/resource_bundle.h"
 #include "app/slide_animation.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/translate/translate_infobar_delegate.h"
@@ skipping 118 matching lines @@
   View::ConvertPointToScreen(menu_button, &menu_position);
 #if defined(OS_WIN)
   int left_bound = GetSystemMetrics(SM_XVIRTUALSCREEN);
   if (menu_position.x() < left_bound)
     menu_position.set_x(left_bound);
 #endif
   return menu_position;
 }
 
 TranslateInfoBarDelegate* TranslateInfoBarBase::GetDelegate() const {
-  return static_cast<TranslateInfoBarDelegate*>(delegate());
+  return delegate()->AsTranslateInfoBarDelegate();
 }
 
 const InfoBarBackground& TranslateInfoBarBase::GetBackground() const {
-  return GetDelegate()->IsError() ? error_background_ : normal_background_;
+  return (delegate() && GetDelegate()->IsError()) ?
+      error_background_ : normal_background_;
 }
 
 void TranslateInfoBarBase::FadeBackground(gfx::Canvas* canvas,
                                           double animation_value,
                                           const InfoBarBackground& background) {
   // Draw the background into an offscreen buffer with alpha value per animation
   // value, then blend it back into the current canvas.
   canvas->SaveLayerAlpha(static_cast<int>(animation_value * 255));
   canvas->AsCanvasSkia()->drawARGB(0, 255, 255, 255, SkXfermode::kClear_Mode);
   background.Paint(canvas, this);
@@ skipping 15 matching lines @@
       infobar = new TranslateMessageInfoBar(this);
       break;
     default:
       NOTREACHED();
   }
   // Set |infobar_view_| so that the model can notify the infobar when it
   // changes.
   infobar_view_ = infobar;
   return infobar;
 }