EDK: mostly style fix: change TestIOThread::Mode to an enum class.

mojo/edk/system/raw_channel_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 "mojo/edk/system/raw_channel.h"
 
 #include <stdint.h>
 #include <stdio.h>
 
 #include <memory>
@@ skipping 55 matching lines @@
   size_t write_size = 0;
   mojo::test::BlockingWrite(handle, message->main_buffer(),
                             message->main_buffer_size(), &write_size);
   return write_size == message->main_buffer_size();
 }
 
 // -----------------------------------------------------------------------------
 
 class RawChannelTest : public testing::Test {
  public:
-  RawChannelTest() : io_thread_(mojo::test::TestIOThread::kManualStart) {}
+  RawChannelTest() : io_thread_(mojo::test::TestIOThread::StartMode::MANUAL) {}
   ~RawChannelTest() override {}
 
   void SetUp() override {
     embedder::PlatformChannelPair channel_pair;
     handles[0] = channel_pair.PassServerHandle();
     handles[1] = channel_pair.PassClientHandle();
     io_thread_.Start();
   }
 
   void TearDown() override {
@@ skipping 751 matching lines @@
       FROM_HERE,
       base::Bind(&RawChannel::Shutdown, base::Unretained(rc_read.get())));
   io_thread()->PostTaskAndWait(
       FROM_HERE,
       base::Bind(&RawChannel::Shutdown, base::Unretained(rc_write.get())));
 }
 
 }  // namespace
 }  // namespace system
 }  // namespace mojo