Media Galleries API: Fix MediaGalleriesPreferences finders race.

chrome/browser/storage_monitor/storage_monitor.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/storage_monitor/storage_monitor.h"
 
 #include "base/stl_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/storage_monitor/removable_storage_observer.h"
@@ skipping 62 matching lines @@
     on_initialize_callbacks_.push_back(callback);
   }
 
   if (initializing_)
     return;
 
   initializing_ = true;
   Init();
 }
 
-bool StorageMonitor::IsInitialized() {
+bool StorageMonitor::IsInitialized() const {
   return initialized_;
 }
 
 void StorageMonitor::AddObserver(RemovableStorageObserver* obs) {
   observer_list_->AddObserver(obs);
 }
 
 void StorageMonitor::RemoveObserver(
     RemovableStorageObserver* obs) {
   observer_list_->RemoveObserver(obs);
@@ skipping 71 matching lines @@
     info = it->second;
     storage_map_.erase(it);
   }
 
   DVLOG(1) << "StorageDetached for id " << id;
   if (StorageInfo::IsRemovableDevice(info.device_id())) {
     observer_list_->Notify(
         &RemovableStorageObserver::OnRemovableStorageDetached, info);
   }
 }