When we process the tickler message in our windows message pump, we should not dispatch

base/message_loop.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 "base/message_loop.h"
 
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 #include <gdk/gdk.h>
 #include <gdk/gdkx.h>
 #endif
@@ skipping 105 matching lines @@
 MessageLoop::DestructionObserver::~DestructionObserver() {
 }
 
 //------------------------------------------------------------------------------
 
 MessageLoop::MessageLoop(Type type)
     : type_(type),
       nestable_tasks_allowed_(true),
       exception_restoration_(false),
       state_(NULL),
+#ifdef OS_WIN
+      os_modal_loop_(false),
+#endif  // OS_WIN
       next_sequence_num_(0) {
   DCHECK(!current()) << "should only have one message loop per thread";
   lazy_tls_ptr.Pointer()->Set(this);
 
 // TODO(rvargas): Get rid of the OS guards.
 #if defined(OS_WIN)
 #define MESSAGE_PUMP_UI new base::MessagePumpForUI()
 #define MESSAGE_PUMP_IO new base::MessagePumpForIO()
 #elif defined(OS_MACOSX)
 #define MESSAGE_PUMP_UI base::MessagePumpMac::Create()
@@ skipping 577 matching lines @@
                                            Watcher *delegate) {
   return pump_libevent()->WatchFileDescriptor(
       fd,
       persistent,
       static_cast<base::MessagePumpLibevent::Mode>(mode),
       controller,
       delegate);
 }
 
 #endif