Rename Thread -> OSThread.

runtime/vm/message_handler_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/message_handler.h"
 #include "vm/port.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
@@ skipping 293 matching lines @@
 
   // Start a thread which sends more messages.
   Dart_Port* ports = new Dart_Port[10];
   for (int i = 0; i < 10; i++) {
     ports[i] = PortMap::CreatePort(&handler);
   }
   ThreadStartInfo info;
   info.handler = &handler;
   info.ports = ports;
   info.count = 10;
-  Thread::Start(SendMessages, reinterpret_cast<uword>(&info));
+  OSThread::Start(SendMessages, reinterpret_cast<uword>(&info));
   while (sleep < kMaxSleep && handler.message_count() < 11) {
     OS::Sleep(10);
     sleep += 10;
   }
   handler_ports = handler.port_buffer();
   EXPECT_EQ(11, handler.message_count());
   EXPECT(handler.start_called());
   EXPECT(!handler.end_called());
   EXPECT_EQ(port, handler_ports[0]);
   for (int i = 1; i < 11; i++) {
     EXPECT_EQ(ports[i - 1], handler_ports[i]);
   }
   handler_peer.decrement_live_ports();
   EXPECT(!handler.HasLivePorts());
   PortMap::ClosePorts(&handler);
 }
 
 }  // namespace dart