Correct spelling of message.

runtime/vm/isolate.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 "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/assert.h"
 #include "platform/text_buffer.h"
@@ skipping 1621 matching lines @@
 
   // Clean up debugger resources.
   if (FLAG_support_debugger) {
     debugger()->Shutdown();
   }
 
 
   // Close all the ports owned by this isolate.
   PortMap::ClosePorts(message_handler());
 
-  // Fail fast if anybody tries to post any more messsages to this isolate.
+  // Fail fast if anybody tries to post any more messages to this isolate.
   delete message_handler();
   set_message_handler(NULL);
   if (FLAG_support_timeline) {
     // Before analyzing the isolate's timeline blocks- reclaim all cached
     // blocks.
     Timeline::ReclaimCachedBlocksFromThreads();
   }
 
 // Dump all timing data for the isolate.
 #ifndef PRODUCT
@@ skipping 1293 matching lines @@
 void IsolateSpawnState::DecrementSpawnCount() {
   ASSERT(spawn_count_monitor_ != NULL);
   ASSERT(spawn_count_ != NULL);
   MonitorLocker ml(spawn_count_monitor_);
   ASSERT(*spawn_count_ > 0);
   *spawn_count_ = *spawn_count_ - 1;
   ml.Notify();
 }
 
 }  // namespace dart