Update InterceptingResourceHandler tests to use MockResourceLoader.

content/browser/loader/intercepting_resource_handler.h

Index: content/browser/loader/intercepting_resource_handler.h
diff --git a/content/browser/loader/intercepting_resource_handler.h b/content/browser/loader/intercepting_resource_handler.h
index f0a60824d9e03b08cb40c84103f798c4dcb1c7d2..7ae6b720af75f06923b83d1d3e1a3367eb1494a1 100644
--- a/content/browser/loader/intercepting_resource_handler.h
+++ b/content/browser/loader/intercepting_resource_handler.h
@@ -118,6 +118,9 @@ class CONTENT_EXPORT InterceptingResourceHandler
   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_;
@@ -136,6 +139,8 @@ class CONTENT_EXPORT InterceptingResourceHandler
 
   scoped_refptr<ResourceResponse> response_;
 
+  base::WeakPtrFactory<InterceptingResourceHandler> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(InterceptingResourceHandler);
 };