Rename TARGET_OS_* to HOST_OS_*.

runtime/bin/vmservice_impl.cc

 // Copyright (c) 2013, 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 "bin/vmservice_impl.h"
 
 #include "include/dart_api.h"
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
@@ skipping 220 matching lines @@
   }
   result = DartUtils::SetIntegerField(library, "_port", server_port);
   SHUTDOWN_ON_ERROR(result);
   result = Dart_SetField(library, DartUtils::NewString("_autoStart"),
                          Dart_NewBoolean(auto_start));
   SHUTDOWN_ON_ERROR(result);
   result = Dart_SetField(library, DartUtils::NewString("_originCheckDisabled"),
                          Dart_NewBoolean(dev_mode_server));
 
 // Are we running on Windows?
-#if defined(TARGET_OS_WINDOWS)
+#if defined(HOST_OS_WINDOWS)
   Dart_Handle is_windows = Dart_True();
 #else
   Dart_Handle is_windows = Dart_False();
 #endif
   result =
       Dart_SetField(library, DartUtils::NewString("_isWindows"), is_windows);
   SHUTDOWN_ON_ERROR(result);
 
 // Are we running on Fuchsia?
-#if defined(TARGET_OS_FUCHSIA)
+#if defined(HOST_OS_FUCHSIA)
   Dart_Handle is_fuchsia = Dart_True();
 #else
   Dart_Handle is_fuchsia = Dart_False();
 #endif
   result =
       Dart_SetField(library, DartUtils::NewString("_isFuchsia"), is_fuchsia);
   SHUTDOWN_ON_ERROR(result);
 
   // Get _getWatchSignalInternal from dart:io.
   Dart_Handle dart_io_str = Dart_NewStringFromCString(DartUtils::kIOLibURL);
@@ skipping 103 matching lines @@
   Dart_Handle source = GetSource(url_string);
   if (Dart_IsError(source)) {
     return source;
   }
   return Dart_LoadSource(library, url, Dart_Null(), source, 0, 0);
 }
 
 
 }  // namespace bin
 }  // namespace dart