Make it clear what last_sync_timestamp actually tracks. Update

chrome/common/webmessageportchannel_impl.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/webmessageportchannel_impl.h"
 
 #include "chrome/common/child_process.h"
 #include "chrome/common/child_thread.h"
 #include "chrome/common/worker_messages.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebString.h"
@@ skipping 134 matching lines @@
         NewRunnableMethod(this, &WebMessagePortChannelImpl::Entangle, channel));
     return;
   }
 
   Send(new WorkerProcessHostMsg_Entangle(
       message_port_id_, channel->message_port_id()));
 }
 
 void WebMessagePortChannelImpl::QueueMessages() {
   // This message port is being sent elsewhere (perhaps to another process).
-  // The new endpoint needs to recieve the queued messages, including ones that
+  // The new endpoint needs to receive the queued messages, including ones that
   // could still be in-flight.  So we tell the browser to queue messages, and it
   // sends us an ack, whose receipt we know means that no more messages are
   // in-flight.  We then send the queued messages to the browser, which prepends
   // them to the ones it queued and it sends them to the new endpoint.
   Send(new WorkerProcessHostMsg_QueueMessages(message_port_id_));
 
   // The process could potentially go away while we're still waiting for
   // in-flight messages.  Ensure it stays alive.
   ChildProcess::current()->AddRefProcess();
 }
@@ skipping 57 matching lines @@
   }
 
   Send(new WorkerProcessHostMsg_SendQueuedMessages(
       message_port_id_, queued_messages));
 
   message_port_id_ = MSG_ROUTING_NONE;
 
   Release();
   ChildProcess::current()->ReleaseProcess();
 }