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diff --git a/chrome/browser/dom_ui/dom_ui_theme_source.h b/chrome/browser/dom_ui/dom_ui_theme_source.h
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+++ b/chrome/browser/dom_ui/dom_ui_theme_source.h
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+// Copyright (c) 2009 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_DOM_UI_DOM_UI_THEME_SOURCE_H_
+#define CHROME_BROWSER_DOM_UI_DOM_UI_THEME_SOURCE_H_
+
+#include "chrome/browser/dom_ui/chrome_url_data_manager.h"
+
+class Profile;
+
+// ThumbnailSource is the gateway between network-level chrome:
+// requests for thumbnails and the history backend that serves these.
+class DOMUIThemeSource : public ChromeURLDataManager::DataSource {
+public:
+  explicit DOMUIThemeSource(Profile* profile);
+
+  // Called when the network layer has requested a resource underneath
+  // the path we registered.
+  virtual void StartDataRequest(const std::string& path, int request_id);
+  virtual std::string GetMimeType(const std::string& path) const {
+    return "image/png";
+  }
+
+private:
+  Profile* profile_;
+  DISALLOW_COPY_AND_ASSIGN(DOMUIThemeSource);
+};
+
+#endif  // CHROME_BROWSER_DOM_UI_DOM_UI_THEME_SOURCE_H_