Mount notification not showing up fix

chrome/browser/chromeos/extensions/file_browser_event_router.cc

 // Copyright (c) 2011 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/chromeos/extensions/file_browser_event_router.h"
 
 #include "base/json/json_writer.h"
 #include "base/memory/singleton.h"
 #include "base/stl_util-inl.h"
 #include "base/values.h"
@@ skipping 38 matching lines @@
 
 ExtensionFileBrowserEventRouter::ExtensionFileBrowserEventRouter()
     : profile_(NULL) {
 }
 
 ExtensionFileBrowserEventRouter::~ExtensionFileBrowserEventRouter() {
 }
 
 void ExtensionFileBrowserEventRouter::ObserveFileSystemEvents(
     Profile* profile) {
-  if (profile_ || !profile)
+  if (!profile)
     return;
   profile_ = profile;
   if (!chromeos::CrosLibrary::Get()->EnsureLoaded())
     return;
   if (chromeos::UserManager::Get()->user_is_logged_in()) {
     chromeos::MountLibrary* lib =
         chromeos::CrosLibrary::Get()->GetMountLibrary();
+    lib->RemoveObserver(this);
     lib->AddObserver(this);
     lib->RequestMountInfoRefresh();
   }
 }
 
 void ExtensionFileBrowserEventRouter::StopObservingFileSystemEvents() {
   if (!profile_)
     return;
   if (!chromeos::CrosLibrary::Get()->EnsureLoaded())
     return;
@@ skipping 172 matching lines @@
        ++iter) {
     const std::string& notification_device_path = iter->first;
     // Doing a sub string match so that we find if this new one is a subdevice
     // of another already inserted device.
     if (StartsWithASCII(system_path, notification_device_path, true)) {
       return iter;
     }
   }
   return notifications_.end();
 }