Reduce boilerplate when creating simple mojom::URLLoaders.

content/network/cache_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/network/cache_url_loader.h"
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/strings/string_util.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 34 matching lines @@
 
     if (rv != net::ERR_IO_PENDING)
       DataAvailable(rv);
   }
 
   ~CacheURLLoader() {}
 
  private:
   void DataAvailable(int result) {
     DCHECK_EQ(net::OK, result);
-    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 = data_.size();
-    mojo::DataPipe data_pipe(options);
-
-    DCHECK(data_pipe.producer_handle.is_valid());
-    DCHECK(data_pipe.consumer_handle.is_valid());
+    mojo::DataPipe data_pipe(data_.size());
 
     CHECK(
         mojo::common::BlockingCopyFromString(data_, data_pipe.producer_handle));
 
     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 = data_.size();
-    request_complete_data.encoded_body_length = data_.size();
-    client_->OnComplete(request_complete_data);
+    client_->OnComplete(ResourceRequestCompletionStatus(data_.size()));
 
     // So we don't delete |this| in the constructor.
     base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE, this);
   }
 
   std::string data_;
   mojom::URLLoaderClientPtr client_;
   net::ViewCacheHelper cache_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(CacheURLLoader);
 };
 }
 
 void StartCacheURLLoader(const ResourceRequest& request,
                          net::URLRequestContext* request_context,
                          mojom::URLLoaderClientPtr client) {
   new CacheURLLoader(request, request_context, std::move(client));
 }
 
 }  // namespace content