Fix crash on launch when remoting lab is turned on on Windows.

chrome/browser/service/service_process_control.cc

 // Copyright (c) 2010 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/browser/service/service_process_control.h"
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/process_util.h"
 #include "base/thread.h"
@@ skipping 117 matching lines @@
 
 void ServiceProcessControl::Launch(Task* task) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   // If the service process is already running then connects to it.
   if (CheckServiceProcessRunning()) {
     ConnectInternal(task);
     return;
   }
 
+  // Prevent quick calls to Launch in succession from causing a crash.
+  // TODO(scottbyer) - ServiceProcessControl launch task callback code needs to
+  // be enhanced to deal with this properly.  See
+  // http://code.google.com/p/chromium/issues/detail?id=58802
+  if (launcher_) {
+    return;
+  }
+
   // A service process should have a different mechanism for starting, but now
   // we start it as if it is a child process.
   FilePath exe_path = ChildProcessHost::GetChildPath(true);
   if (exe_path.empty()) {
     NOTREACHED() << "Unable to get service process binary name.";
   }
 
   CommandLine* cmd_line = new CommandLine(exe_path);
   cmd_line->AppendSwitchASCII(switches::kProcessType,
                               switches::kServiceProcess);
@@ skipping 114 matching lines @@
 }
 
 bool ServiceProcessControl::GetCloudPrintProxyStatus(
     Callback2<bool, std::string>::Type* cloud_print_status_callback) {
   DCHECK(cloud_print_status_callback);
   cloud_print_status_callback_.reset(cloud_print_status_callback);
   return Send(new ServiceMsg_IsCloudPrintProxyEnabled);
 }
 
 DISABLE_RUNNABLE_METHOD_REFCOUNT(ServiceProcessControl);