Rename fletch -> dartino

src/pkg/power_management/power_management_extension_macos.cc

 // Copyright (c) 2015, the Dartino 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.md file.
 
-#if defined(FLETCH_TARGET_OS_MACOS)
+#if defined(DARTINO_TARGET_OS_MACOS)
 
 #include <IOKit/pwr_mgt/IOPMLib.h>
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 
 #include "power_management_extension.h"
 
 int64_t HandleDisableSleep(const char* reason) {
   CFStringRef reasonForActivity =
       CFStringCreateWithCString(NULL, reason, kCFStringEncodingUTF8);
 
   IOPMAssertionID assertionID;
   IOReturn success = IOPMAssertionCreateWithName(
       kIOPMAssertionTypeNoDisplaySleep, kIOPMAssertionLevelOn,
       reasonForActivity, &assertionID);
   if (success == kIOReturnSuccess) {
     return assertionID;
   } else {
     return -1;
   }
 }
 
 void HandleEnableSleep(int64_t disable_id) {
   IOPMAssertionRelease(disable_id);
 }
 
-#endif  // FLETCH_TARGET_OS_MACOS
+#endif  // DARTINO_TARGET_OS_MACOS