Reduce boilerplate when creating simple mojom::URLLoaders.

media/mojo/common/mojo_decoder_buffer_converter_unittest.cc

 // Copyright 2014 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 "media/mojo/common/mojo_decoder_buffer_converter.h"
 
 #include <stdint.h>
 
 #include <memory>
 
@@ skipping 13 matching lines @@
 
 MATCHER_P(MatchesDecoderBuffer, buffer, "") {
   DCHECK(arg);
   return arg->MatchesForTesting(*buffer);
 }
 
 class MojoDecoderBufferConverter {
  public:
   MojoDecoderBufferConverter(
       uint32_t data_pipe_capacity_bytes = kDefaultDataPipeCapacityBytes) {
-    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_pipe_capacity_bytes;
-    mojo::DataPipe data_pipe(options);
+    mojo::DataPipe data_pipe(data_pipe_capacity_bytes);
 
     writer = base::MakeUnique<MojoDecoderBufferWriter>(
         std::move(data_pipe.producer_handle));
     reader = base::MakeUnique<MojoDecoderBufferReader>(
         std::move(data_pipe.consumer_handle));
   }
 
   void ConvertAndVerify(const scoped_refptr<DecoderBuffer>& media_buffer) {
     base::RunLoop run_loop;
     base::MockCallback<MojoDecoderBufferReader::ReadCB> mock_cb;
@@ skipping 146 matching lines @@
       converter.writer->WriteDecoderBuffer(media_buffer);
   converter.reader->ReadDecoderBuffer(std::move(mojo_buffer), mock_cb.Get());
 
   // Before the entire data is transmitted, close the handle on writer side.
   // The reader side will get notified and report the error.
   converter.writer.reset();
   run_loop.Run();
 }
 
 }  // namespace media