Revert of Allow MojoAsyncResourceHandler::OnWillRead to complete asyncronously

content/browser/loader/mojo_async_resource_handler.h

Index: content/browser/loader/mojo_async_resource_handler.h
diff --git a/content/browser/loader/mojo_async_resource_handler.h b/content/browser/loader/mojo_async_resource_handler.h
index 57198253f79079312d11140009f7688ffa53a51e..ce84d64bf100a441457cb5c8ae30d25f11d8ba6c 100644
--- a/content/browser/loader/mojo_async_resource_handler.h
+++ b/content/browser/loader/mojo_async_resource_handler.h
@@ -132,18 +132,10 @@
   bool has_checked_for_sufficient_resources_ = false;
   bool sent_received_response_message_ = false;
   bool is_using_io_buffer_not_from_writer_ = false;
-  // True if OnWillRead was deferred, in order to wait to be able to allocate a
-  // buffer.
-  bool did_defer_on_will_read_ = false;
   bool did_defer_on_writing_ = false;
   bool did_defer_on_redirect_ = false;
   base::TimeTicks response_started_ticks_;
   int64_t reported_total_received_bytes_ = 0;
-
-  // Pointer to parent's information about the read buffer. Only non-null while
-  // OnWillRead is deferred.
-  scoped_refptr<net::IOBuffer>* parent_buffer_ = nullptr;
-  int* parent_buffer_size_ = nullptr;
 
   mojo::SimpleWatcher handle_watcher_;
   std::unique_ptr<mojom::URLLoader> url_loader_;