Enable use_once_callback for //content/common/*.mojom

content/child/url_loader_client_impl_unittest.cc

 // Copyright 2016 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/child/url_loader_client_impl.h"
 
 #include <vector>
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 44 matching lines @@
                             int32_t request_id,
                             uint32_t options,
                             const ResourceRequest& url_request,
                             mojom::URLLoaderClientPtr client) override {
     url_loader_client_ = std::move(client);
   }
 
   void SyncLoad(int32_t routing_id,
                 int32_t request_id,
                 const ResourceRequest& request,
-                const SyncLoadCallback& callback) override {
+                SyncLoadCallback callback) override {
     NOTREACHED();
   }
 
   static MojoCreateDataPipeOptions DataPipeOptions() {
     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 = 4096;
     return options;
@@ skipping 442 matching lines @@
 
   dispatcher_->SetDefersLoading(request_id_, false);
   base::RunLoop().RunUntilIdle();
   EXPECT_TRUE(request_peer_context_.received_response);
   EXPECT_TRUE(request_peer_context_.complete);
   EXPECT_EQ(4, request_peer_context_.total_encoded_data_length);
   EXPECT_FALSE(request_peer_context_.cancelled);
 }
 
 }  // namespace content