[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 682264223c40b147f4446a65e51ef9b9b042da53..47e50cc26779d4d00d4085bb3f174145a0465122 100644
--- a/chrome/browser/storage_monitor/storage_monitor.cc
+++ b/chrome/browser/storage_monitor/storage_monitor.cc
@@ -72,6 +72,10 @@ void StorageMonitor::Initialize(base::Closure callback) {
     on_initialize_callbacks_.push_back(callback);
   }
 
+  if (initializing_)
+    return;
+
+  initializing_ = true;
   Init();
 }
 
@@ -108,6 +112,7 @@ void StorageMonitor::EjectDevice(
 
 StorageMonitor::StorageMonitor()
     : observer_list_(new ObserverListThreadSafe<RemovableStorageObserver>()),
+      initializing_(false),
       initialized_(false),
       transient_device_ids_(new TransientDeviceIds) {
   receiver_.reset(new ReceiverImpl(this));