- Change "static final" to "static const" in the runtime/ directory.

runtime/bin/process.dart

 // 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.
 
 /** Exit the Dart VM process with the given [status] code. */
 void exit(int status) {
   if (status is !int) {
     throw new IllegalArgumentException("int status expected");
   }
   _exit(status);
@@ skipping 176 matching lines @@
    * code-points outside the ASCII range is passed in.
    */
   Map<String, String> environment;
 }
 
 /**
  * On Posix systems, [ProcessSignal] is used to send a specific signal
  * to a child process, see [:Process.kill:].
  */
 class ProcessSignal {
-  static final ProcessSignal SIGHUP = const ProcessSignal._signal(1);
-  static final ProcessSignal SIGINT = const ProcessSignal._signal(2);
-  static final ProcessSignal SIGQUIT = const ProcessSignal._signal(3);
-  static final ProcessSignal SIGILL = const ProcessSignal._signal(4);
-  static final ProcessSignal SIGTRAP = const ProcessSignal._signal(5);
-  static final ProcessSignal SIGABRT = const ProcessSignal._signal(6);
-  static final ProcessSignal SIGBUS = const ProcessSignal._signal(7);
-  static final ProcessSignal SIGFPE = const ProcessSignal._signal(8);
-  static final ProcessSignal SIGKILL = const ProcessSignal._signal(9);
-  static final ProcessSignal SIGUSR1 = const ProcessSignal._signal(10);
-  static final ProcessSignal SIGSEGV = const ProcessSignal._signal(11);
-  static final ProcessSignal SIGUSR2 = const ProcessSignal._signal(12);
-  static final ProcessSignal SIGPIPE = const ProcessSignal._signal(13);
-  static final ProcessSignal SIGALRM = const ProcessSignal._signal(14);
-  static final ProcessSignal SIGTERM = const ProcessSignal._signal(15);
-  static final ProcessSignal SIGCHLD = const ProcessSignal._signal(17);
-  static final ProcessSignal SIGCONT = const ProcessSignal._signal(18);
-  static final ProcessSignal SIGSTOP = const ProcessSignal._signal(19);
-  static final ProcessSignal SIGTSTP = const ProcessSignal._signal(20);
-  static final ProcessSignal SIGTTIN = const ProcessSignal._signal(21);
-  static final ProcessSignal SIGTTOU = const ProcessSignal._signal(22);
-  static final ProcessSignal SIGURG = const ProcessSignal._signal(23);
-  static final ProcessSignal SIGXCPU = const ProcessSignal._signal(24);
-  static final ProcessSignal SIGXFSZ = const ProcessSignal._signal(25);
-  static final ProcessSignal SIGVTALRM = const ProcessSignal._signal(26);
-  static final ProcessSignal SIGPROF = const ProcessSignal._signal(27);
-  static final ProcessSignal SIGPOLL = const ProcessSignal._signal(29);
-  static final ProcessSignal SIGSYS = const ProcessSignal._signal(31);
+  static const ProcessSignal SIGHUP = const ProcessSignal._signal(1);
+  static const ProcessSignal SIGINT = const ProcessSignal._signal(2);
+  static const ProcessSignal SIGQUIT = const ProcessSignal._signal(3);
+  static const ProcessSignal SIGILL = const ProcessSignal._signal(4);
+  static const ProcessSignal SIGTRAP = const ProcessSignal._signal(5);
+  static const ProcessSignal SIGABRT = const ProcessSignal._signal(6);
+  static const ProcessSignal SIGBUS = const ProcessSignal._signal(7);
+  static const ProcessSignal SIGFPE = const ProcessSignal._signal(8);
+  static const ProcessSignal SIGKILL = const ProcessSignal._signal(9);
+  static const ProcessSignal SIGUSR1 = const ProcessSignal._signal(10);
+  static const ProcessSignal SIGSEGV = const ProcessSignal._signal(11);
+  static const ProcessSignal SIGUSR2 = const ProcessSignal._signal(12);
+  static const ProcessSignal SIGPIPE = const ProcessSignal._signal(13);
+  static const ProcessSignal SIGALRM = const ProcessSignal._signal(14);
+  static const ProcessSignal SIGTERM = const ProcessSignal._signal(15);
+  static const ProcessSignal SIGCHLD = const ProcessSignal._signal(17);
+  static const ProcessSignal SIGCONT = const ProcessSignal._signal(18);
+  static const ProcessSignal SIGSTOP = const ProcessSignal._signal(19);
+  static const ProcessSignal SIGTSTP = const ProcessSignal._signal(20);
+  static const ProcessSignal SIGTTIN = const ProcessSignal._signal(21);
+  static const ProcessSignal SIGTTOU = const ProcessSignal._signal(22);
+  static const ProcessSignal SIGURG = const ProcessSignal._signal(23);
+  static const ProcessSignal SIGXCPU = const ProcessSignal._signal(24);
+  static const ProcessSignal SIGXFSZ = const ProcessSignal._signal(25);
+  static const ProcessSignal SIGVTALRM = const ProcessSignal._signal(26);
+  static const ProcessSignal SIGPROF = const ProcessSignal._signal(27);
+  static const ProcessSignal SIGPOLL = const ProcessSignal._signal(29);
+  static const ProcessSignal SIGSYS = const ProcessSignal._signal(31);
 
   const ProcessSignal._signal(int this._signalNumber);
   final int _signalNumber;
 }
 
 
 class ProcessException implements Exception {
   const ProcessException([String this.message, int this.errorCode = 0]);
   String toString() => "ProcessException: $message ($errorCode)";
 
   /**
    * Contains the system message for the process exception if any.
    */
   final String message;
 
   /**
    * Contains the OS error code for the process exception if any.
    */
   final int errorCode;
 }