webui: Replace usage of deprecated DataPipe

Replaces usage of DataPipe, which is deprecated, with CreateDataPipe.
There is no change in behavior, if the pipe fails to be created we will
crash.

Bug: 1012150
Change-Id: Ib077284f14c7232a0a78afcf0d1d3e1cc4f07380
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1846621Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704460}

content/browser/webui/web_ui_url_loader_factory.cc

@@ -81,17 +81,26 @@ void ReadData(scoped_refptr<network::ResourceResponse> headers,
 
   uint32_t output_size = bytes->size();
 
-  mojo::DataPipe data_pipe(output_size);
+  MojoCreateDataPipeOptions options;
+  options.struct_size = sizeof(MojoCreateDataPipeOptions);
+  options.flags = MOJO_CREATE_DATA_PIPE_FLAG_NONE;
+  options.element_num_bytes = 1;
+  options.capacity_num_bytes = output_size;
+  mojo::ScopedDataPipeProducerHandle pipe_producer_handle;
+  mojo::ScopedDataPipeConsumerHandle pipe_consumer_handle;
+  MojoResult create_result = mojo::CreateDataPipe(
+      &options, &pipe_producer_handle, &pipe_consumer_handle);
+  CHECK_EQ(create_result, MOJO_RESULT_OK);
 
   void* buffer = nullptr;
   uint32_t num_bytes = output_size;
-  MojoResult result = data_pipe.producer_handle->BeginWriteData(
+  MojoResult result = pipe_producer_handle->BeginWriteData(
       &buffer, &num_bytes, MOJO_WRITE_DATA_FLAG_NONE);
   CHECK_EQ(result, MOJO_RESULT_OK);
   CHECK_GE(num_bytes, output_size);
 
   memcpy(buffer, bytes->front(), output_size);
-  result = data_pipe.producer_handle->EndWriteData(output_size);
+  result = pipe_producer_handle->EndWriteData(output_size);
   CHECK_EQ(result, MOJO_RESULT_OK);
 
   // For media content, |content_length| must be known upfront for data that is
@@ -104,7 +113,7 @@ void ReadData(scoped_refptr<network::ResourceResponse> headers,
   client.Bind(std::move(client_info));
   client->OnReceiveResponse(headers->head);
 
-  client->OnStartLoadingResponseBody(std::move(data_pipe.consumer_handle));
+  client->OnStartLoadingResponseBody(std::move(pipe_consumer_handle));
   network::URLLoaderCompletionStatus status(net::OK);
   status.encoded_data_length = output_size;
   status.encoded_body_length = output_size;