Speculative fix for crash in DOMUIThumbnailSource.

chrome/browser/dom_ui/dom_ui_theme_source.h

Index: chrome/browser/dom_ui/dom_ui_theme_source.h
diff --git a/chrome/browser/dom_ui/dom_ui_theme_source.h b/chrome/browser/dom_ui/dom_ui_theme_source.h
index 7512fbda5588cf0a5937c0df54513ed2406a2ffd..61f3abfcbe9b5131d6ec6d2b0fcb32ba1e5be994 100644
--- a/chrome/browser/dom_ui/dom_ui_theme_source.h
+++ b/chrome/browser/dom_ui/dom_ui_theme_source.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -11,6 +11,7 @@
 #include "chrome/browser/dom_ui/chrome_url_data_manager.h"
 
 class Profile;
+class RefCountedBytes;
 
 // ThumbnailSource is the gateway between network-level chrome:
 // requests for thumbnails and the history backend that serves these.
@@ -29,7 +30,7 @@ class DOMUIThemeSource : public ChromeURLDataManager::DataSource {
   virtual MessageLoop* MessageLoopForRequestPath(const std::string& path) const;
 
  protected:
-  virtual ~DOMUIThemeSource() {}
+  virtual ~DOMUIThemeSource();
 
  private:
   // Fetch and send the theme bitmap.