Add mimetypes on the "chrome-resource://" responses....

chrome/browser/browser_about_handler.cc

 // Copyright (c) 2006-2008 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/browser_about_handler.h"
 
 #include <string>
 #include <vector>
 
 #include "base/file_version_info.h"
@@ skipping 52 matching lines @@
 class AboutSource : public ChromeURLDataManager::DataSource {
  public:
   // Creates our datasource.
   AboutSource();
   virtual ~AboutSource();
 
   // 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&) const {
+    return "text/html";
+  }
+
   // Send the response data.
   void FinishDataRequest(const std::string& html, int request_id);
 
  private:
   DISALLOW_EVIL_CONSTRUCTORS(AboutSource);
 };
 
 // Handling about:memory is complicated enough to encapsulate it's
 // related methods into a single class.
 class AboutMemoryHandler : public MemoryDetails {
@@ skipping 572 matching lines @@
   AboutSource* about_source = static_cast<AboutSource*>(source_);
   about_source->FinishDataRequest(template_html, request_id_);
 }
 
 // static
 void BrowserAboutHandler::AboutMemory(AboutSource* source, int request_id) {
   // The AboutMemoryHandler cleans itself up.
   new AboutMemoryHandler(source, request_id);
 }