[Media Galleries] Lazily initialize the storage monitor.

chrome/browser/media_galleries/media_galleries_dialog_controller.cc

Index: chrome/browser/media_galleries/media_galleries_dialog_controller.cc
diff --git a/chrome/browser/media_galleries/media_galleries_dialog_controller.cc b/chrome/browser/media_galleries/media_galleries_dialog_controller.cc
index 56243441a859c7a2fbf6d1202add9d090952a82f..cdc075585ffc7f5083eac29b15b0c82b1ab8e9ac 100644
--- a/chrome/browser/media_galleries/media_galleries_dialog_controller.cc
+++ b/chrome/browser/media_galleries/media_galleries_dialog_controller.cc
@@ -98,11 +98,18 @@ MediaGalleriesDialogController::MediaGalleriesDialogController(
     const base::Closure& on_finish)
       : web_contents_(web_contents),
         extension_(&extension),
-        on_finish_(on_finish) {
+        on_finish_(on_finish),
+        weak_ptr_factory_(this) {
+  StorageMonitor::GetInstance()->Initialize(base::Bind(
+      &MediaGalleriesDialogController::OnStorageMonitorInitialized,
+      weak_ptr_factory_.GetWeakPtr()));
+}
+
+void MediaGalleriesDialogController::OnStorageMonitorInitialized() {
   MediaFileSystemRegistry* registry =
       g_browser_process->media_file_system_registry();
   preferences_ = registry->GetPreferences(
-      Profile::FromBrowserContext(web_contents->GetBrowserContext()));
+      Profile::FromBrowserContext(web_contents_->GetBrowserContext()));
   InitializePermissions();
 
   dialog_.reset(MediaGalleriesDialog::Create(this));
@@ -117,7 +124,8 @@ MediaGalleriesDialogController::MediaGalleriesDialogController(
 MediaGalleriesDialogController::MediaGalleriesDialogController()
     : web_contents_(NULL),
       extension_(NULL),
-      preferences_(NULL) {}
+      preferences_(NULL),
+      weak_ptr_factory_(this) {}
 
 MediaGalleriesDialogController::~MediaGalleriesDialogController() {
   StorageMonitor* monitor = StorageMonitor::GetInstance();