quick fix to a crash when closing down the browser

chrome/browser/media/media_stream_capture_indicator.cc

 // Copyright (c) 2012 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/media/media_stream_capture_indicator.h"
 
 #include "base/bind.h"
 #include "base/i18n/rtl.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
@@ skipping 313 matching lines @@
 }
 
 void MediaStreamCaptureIndicator::UpdateStatusTrayIconContextMenu() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   scoped_ptr<ui::SimpleMenuModel> menu(new ui::SimpleMenuModel(this));
 
   bool audio = false;
   bool video = false;
   int command_id = IDC_MEDIA_CONTEXT_MEDIA_STREAM_CAPTURE_LIST_FIRST;
   for (CaptureDeviceTabs::iterator iter = tabs_.begin();
-       iter != tabs_.end();  ++iter) {
+       iter != tabs_.end();) {
     string16 tab_title = GetTitle(iter->render_process_id,
                                   iter->render_view_id);
     if (tab_title.empty()) {
       // Delete the entry since the tab has gone away.
-      tabs_.erase(iter);
+      iter = tabs_.erase(iter);
       continue;
     }
 
     // Check if any audio and video devices have been used.
     audio = audio || iter->audio_ref_count > 0;
     video = video || iter->video_ref_count > 0;
 
     string16 message = l10n_util::GetStringFUTF16(
         IDS_MEDIA_STREAM_STATUS_TRAY_MENU_ITEM, tab_title);
     menu->AddItem(command_id, message);
 
     // If reaching the maximum number, no more item will be added to the menu.
     if (command_id == IDC_MEDIA_CONTEXT_MEDIA_STREAM_CAPTURE_LIST_LAST)
       break;
 
     ++command_id;
+    ++iter;
   }
 
   if (!audio && !video) {
     Hide();
     return;
   }
 
   // The icon will take the ownership of the passed context menu.
   status_icon_->SetContextMenu(menu.release());
   UpdateStatusTrayIconDisplay(audio, video);
@@ skipping 83 matching lines @@
 
 void MediaStreamCaptureIndicator::EnsureImageLoadingTracker() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (tracker_.get())
     return;
 
   tracker_.reset(new ImageLoadingTracker(this));
   pending_messages_.clear();
   request_index_ = 0;
 }