[Media Galleries] Lazily initialize the storage monitor.

chrome/browser/storage_monitor/storage_monitor.cc

Index: chrome/browser/storage_monitor/storage_monitor.cc
diff --git a/chrome/browser/storage_monitor/storage_monitor.cc b/chrome/browser/storage_monitor/storage_monitor.cc
index 2e4e42484dd9905f5cb89704657e03ac4b41c6eb..18ca9a42e05b57cc7e37e71e94fd5acb91e84711 100644
--- a/chrome/browser/storage_monitor/storage_monitor.cc
+++ b/chrome/browser/storage_monitor/storage_monitor.cc
@@ -8,6 +8,7 @@
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/storage_monitor/removable_storage_observer.h"
 #include "chrome/browser/storage_monitor/transient_device_ids.h"
+#include "content/public/browser/browser_thread.h"
 
 namespace chrome {
 
@@ -62,6 +63,8 @@ std::vector<StorageInfo> StorageMonitor::GetAttachedStorage() const {
 }
 
 void StorageMonitor::Initialize(base::Closure callback) {
+  //DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+
   if (initialized_) {
     if (!callback.is_null())
       callback.Run();
@@ -130,6 +133,8 @@ StorageMonitor::Receiver* StorageMonitor::receiver() const {
 }
 
 void StorageMonitor::MarkInitialized() {
+  //DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+
   initialized_ = true;
   for (std::vector<base::Closure>::iterator iter =
            on_initialize_callbacks_.begin();