Rename TARGET_OS_* to HOST_OS_*.

runtime/bin/eventhandler.h

 // 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.
 
 #ifndef RUNTIME_BIN_EVENTHANDLER_H_
 #define RUNTIME_BIN_EVENTHANDLER_H_
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
 #include "bin/isolate_data.h"
@@ skipping 587 matching lines @@
 
   bool disable_tokens_;
 
   DISALLOW_COPY_AND_ASSIGN(DescriptorInfoMultipleMixin);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 // The event handler delegation class is OS specific.
-#if defined(TARGET_OS_ANDROID)
+#if defined(HOST_OS_ANDROID)
 #include "bin/eventhandler_android.h"
-#elif defined(TARGET_OS_FUCHSIA)
+#elif defined(HOST_OS_FUCHSIA)
 #include "bin/eventhandler_fuchsia.h"
-#elif defined(TARGET_OS_LINUX)
+#elif defined(HOST_OS_LINUX)
 #include "bin/eventhandler_linux.h"
-#elif defined(TARGET_OS_MACOS)
+#elif defined(HOST_OS_MACOS)
 #include "bin/eventhandler_macos.h"
-#elif defined(TARGET_OS_WINDOWS)
+#elif defined(HOST_OS_WINDOWS)
 #include "bin/eventhandler_win.h"
 #else
 #error Unknown target os.
 #endif
 
 namespace dart {
 namespace bin {
 
 class EventHandler {
  public:
@@ skipping 24 matching lines @@
   friend class EventHandlerImplementation;
   EventHandlerImplementation delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(EventHandler);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // RUNTIME_BIN_EVENTHANDLER_H_