Reduce boilerplate when creating simple mojom::URLLoaders.

content/browser/blob_storage/blob_internals_url_loader.cc

 // Copyright 2017 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 "content/browser/blob_storage/blob_internals_url_loader.h"
 
 #include "content/browser/blob_storage/blob_internals_url_loader.h"
 #include "content/browser/blob_storage/chrome_blob_storage_context.h"
 #include "storage/browser/blob/view_blob_internals_job.h"
 
 namespace content {
 
 void StartBlobInternalsURLLoader(
     const ResourceRequest& request,
     mojom::URLLoaderClientPtrInfo client_info,
     ChromeBlobStorageContext* blob_storage_context) {
   scoped_refptr<net::HttpResponseHeaders> headers(
       new net::HttpResponseHeaders("HTTP/1.1 200 OK"));
   ResourceResponseHead resource_response;
   resource_response.headers = headers;
   resource_response.mime_type = "text/html";
 
   mojom::URLLoaderClientPtr client;
   client.Bind(std::move(client_info));
   client->OnReceiveResponse(resource_response, base::nullopt, nullptr);
 
   std::string output = storage::ViewBlobInternalsJob::GenerateHTML(
       blob_storage_context->context());
-
-  MojoCreateDataPipeOptions options;
-  options.struct_size = sizeof(MojoCreateDataPipeOptions);
-  options.flags = MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE;
-  options.element_num_bytes = 1;
-  options.capacity_num_bytes = output.size();
-  mojo::DataPipe data_pipe(options);
-
-  DCHECK(data_pipe.producer_handle.is_valid());
-  DCHECK(data_pipe.consumer_handle.is_valid());
+  mojo::DataPipe data_pipe(output.size());
 
   void* buffer = nullptr;
   uint32_t num_bytes = output.size();
   MojoResult result =
       BeginWriteDataRaw(data_pipe.producer_handle.get(), &buffer, &num_bytes,
                         MOJO_WRITE_DATA_FLAG_NONE);
   CHECK_EQ(result, MOJO_RESULT_OK);
   CHECK_EQ(num_bytes, output.size());
 
   memcpy(buffer, output.c_str(), output.size());
   result = EndWriteDataRaw(data_pipe.producer_handle.get(), num_bytes);
   CHECK_EQ(result, MOJO_RESULT_OK);
 
   client->OnStartLoadingResponseBody(std::move(data_pipe.consumer_handle));
-
-  ResourceRequestCompletionStatus request_complete_data;
-  request_complete_data.error_code = net::OK;
-  request_complete_data.exists_in_cache = false;
-  request_complete_data.completion_time = base::TimeTicks::Now();
-  request_complete_data.encoded_data_length = output.size();
-  request_complete_data.encoded_body_length = output.size();
-  client->OnComplete(request_complete_data);
+  client->OnComplete(ResourceRequestCompletionStatus(output.size()));
 }
 
 }  // namespace content