"typedef Foo Bar" -> "using Bar = Foo" in //mojo/edk/....

mojo/edk/js/drain_data.h

 // 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.
 
 #ifndef MOJO_EDK_JS_DRAIN_DATA_H_
 #define MOJO_EDK_JS_DRAIN_DATA_H_
 
 #include "base/memory/scoped_vector.h"
 #include "gin/runner.h"
 #include "mojo/public/c/environment/async_waiter.h"
@@ skipping 30 matching lines @@
 
   // Use ReadData() to read whatever is availble now on handle_ and save
   // it in data_buffers_.
   void DataReady(MojoResult result);
   MojoResult ReadData();
 
   // When the remote data pipe handle is closed, or an error occurs, deliver
   // all of the buffered data to the JS Promise and then delete this.
   void DeliverData(MojoResult result);
 
-  typedef std::vector<char> DataBuffer;
+  using DataBuffer = std::vector<char>;
 
   v8::Isolate* isolate_;
   ScopedDataPipeConsumerHandle handle_;
   MojoAsyncWaitID wait_id_;
   base::WeakPtr<gin::Runner> runner_;
   v8::UniquePersistent<v8::Promise::Resolver> resolver_;
   ScopedVector<DataBuffer> data_buffers_;
 };
 
 }  // namespace js
 }  // namespace mojo
 
 #endif  // MOJO_EDK_JS_DRAIN_DATA_H_