storage: Use stl utilities from the base namespace

storage/browser/quota/storage_monitor.cc

Index: storage/browser/quota/storage_monitor.cc
diff --git a/storage/browser/quota/storage_monitor.cc b/storage/browser/quota/storage_monitor.cc
index a0d351fbdd1dc3b7184724cea60eaf264a816c83..87c982e04b629305507f8b4f15844271003ef0f9 100644
--- a/storage/browser/quota/storage_monitor.cc
+++ b/storage/browser/quota/storage_monitor.cc
@@ -119,7 +119,7 @@ void StorageObserverList::MaybeDispatchEvent(
 }
 
 void StorageObserverList::ScheduleUpdateForObserver(StorageObserver* observer) {
-  DCHECK(ContainsKey(observers_, observer));
+  DCHECK(base::ContainsKey(observers_, observer));
   observers_[observer].requires_update = true;
 }
 
@@ -247,7 +247,7 @@ StorageTypeObservers::StorageTypeObservers(QuotaManager* quota_manager)
 }
 
 StorageTypeObservers::~StorageTypeObservers() {
-  STLDeleteValues(&host_observers_map_);
+  base::STLDeleteValues(&host_observers_map_);
 }
 
 void StorageTypeObservers::AddObserver(
@@ -323,7 +323,7 @@ StorageMonitor::StorageMonitor(QuotaManager* quota_manager)
 }
 
 StorageMonitor::~StorageMonitor() {
-  STLDeleteValues(&storage_type_observers_map_);
+  base::STLDeleteValues(&storage_type_observers_map_);
 }
 
 void StorageMonitor::AddObserver(