Do not sniff mime type for fetch() requests

content/browser/loader/mime_sniffing_resource_handler.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_LOADER_MIME_SNIFFING_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_LOADER_MIME_SNIFFING_RESOURCE_HANDLER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "content/browser/loader/layered_resource_handler.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/resource_controller.h"
+#include "content/public/common/request_context_type.h"
 
 namespace net {
 class URLRequest;
 }
 
 namespace content {
 class InterceptingResourceHandler;
 class PluginService;
 class ResourceDispatcherHostImpl;
 struct WebPluginInfo;
@@ skipping 11 matching lines @@
 // Accept header on the request based on its ResourceType, if one isn't already
 // present.
 class CONTENT_EXPORT MimeSniffingResourceHandler
     : public LayeredResourceHandler,
       public ResourceController {
  public:
   MimeSniffingResourceHandler(std::unique_ptr<ResourceHandler> next_handler,
                               ResourceDispatcherHostImpl* host,
                               PluginService* plugin_service,
                               InterceptingResourceHandler* intercepting_handler,
-                              net::URLRequest* request);
+                              net::URLRequest* request,
+                              RequestContextType request_context_type);
   ~MimeSniffingResourceHandler() override;
 
  private:
   friend class MimeSniffingResourceHandlerTest;
   enum State {
     // Starting state of the MimeSniffingResourceHandler. In this state, it is
     // acting as a blind pass-through ResourceHandler until the response is
     // received.
     STATE_STARTING,
 
@@ skipping 100 matching lines @@
   // Used to buffer the reponse received until replay.
   scoped_refptr<ResourceResponse> response_;
   scoped_refptr<net::IOBuffer> read_buffer_;
   int read_buffer_size_;
   int bytes_read_;
 
   // The InterceptingResourceHandler that will perform ResourceHandler swap if
   // needed.
   InterceptingResourceHandler* intercepting_handler_;
 
+  RequestContextType request_context_type_;
+
   base::WeakPtrFactory<MimeSniffingResourceHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MimeSniffingResourceHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_MIME_SNIFFING_RESOURCE_HANDLER_H_