Update InterceptingResourceHandler tests to use MockResourceLoader.

content/browser/loader/intercepting_resource_handler.h

 // Copyright 2016 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_INTERCEPTING_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_LOADER_INTERCEPTING_RESOURCE_HANDLER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 100 matching lines @@
   // Runs necessary operations depending on |state_|. Returns false when an
   // error happens, and set |*defer| to true if the operation continues upon
   // return.
   bool DoLoop(bool* defer);
 
   // The return value and |defer| has the same meaning as DoLoop.
   bool SendPayloadToOldHandler(bool* defer);
   bool SendFirstReadBufferToNewHandler(bool* defer);
   bool SendOnResponseStartedToNewHandler(bool* defer);
 
+  // Wraps calls to DoLoop. Resumes or Cancels underlying request, if needed.
+  void AdvanceState();
+
   State state_ = State::STARTING;
 
   std::unique_ptr<ResourceHandler> new_handler_;
   std::string payload_for_old_handler_;
   size_t payload_bytes_written_ = 0;
 
   // Result of the first read, that may have to be passed to an alternate
   // ResourceHandler instead of the original ResourceHandler.
   scoped_refptr<net::IOBuffer> first_read_buffer_;
   // Instead of |first_read_buffer_|, this handler creates a new IOBuffer with
   // the same size and return it to the client.
   scoped_refptr<net::IOBuffer> first_read_buffer_double_;
   size_t first_read_buffer_size_ = 0;
   size_t first_read_buffer_bytes_read_ = 0;
   size_t first_read_buffer_bytes_written_ = 0;
 
   scoped_refptr<ResourceResponse> response_;
 
+  base::WeakPtrFactory<InterceptingResourceHandler> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(InterceptingResourceHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_INTERCEPTING_RESOURCE_HANDLER_H_