Reduce boilerplate when creating simple mojom::URLLoaders.

media/mojo/common/mojo_decoder_buffer_converter_unittest.cc

Index: media/mojo/common/mojo_decoder_buffer_converter_unittest.cc
diff --git a/media/mojo/common/mojo_decoder_buffer_converter_unittest.cc b/media/mojo/common/mojo_decoder_buffer_converter_unittest.cc
index 124d6ac9e39943eca531de6a63c8d5087c4f63b2..c0c7407b0e7116069921947e8930e30c254a6956 100644
--- a/media/mojo/common/mojo_decoder_buffer_converter_unittest.cc
+++ b/media/mojo/common/mojo_decoder_buffer_converter_unittest.cc
@@ -31,12 +31,7 @@ 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));