chrome: Use stl utilities from the base namespace

chrome/browser/sync_file_system/drive_backend/tracker_id_set.cc

Index: chrome/browser/sync_file_system/drive_backend/tracker_id_set.cc
diff --git a/chrome/browser/sync_file_system/drive_backend/tracker_id_set.cc b/chrome/browser/sync_file_system/drive_backend/tracker_id_set.cc
index 53ea1c90b11ca8cb394e381bde93e52a1563fef6..5e039f924ff106555f1630d430f74d74d9dd8d92 100644
--- a/chrome/browser/sync_file_system/drive_backend/tracker_id_set.cc
+++ b/chrome/browser/sync_file_system/drive_backend/tracker_id_set.cc
@@ -40,7 +40,7 @@ void TrackerIDSet::InsertInactiveTracker(int64_t tracker_id) {
 }
 
 void TrackerIDSet::Erase(int64_t tracker_id) {
-  DCHECK(ContainsKey(tracker_ids_, tracker_id));
+  DCHECK(base::ContainsKey(tracker_ids_, tracker_id));
 
   if (active_tracker_ == tracker_id)
     active_tracker_ = 0;
@@ -49,13 +49,13 @@ void TrackerIDSet::Erase(int64_t tracker_id) {
 
 void TrackerIDSet::Activate(int64_t tracker_id) {
   DCHECK(!active_tracker_);
-  DCHECK(ContainsKey(tracker_ids_, tracker_id));
+  DCHECK(base::ContainsKey(tracker_ids_, tracker_id));
   active_tracker_ = tracker_id;
 }
 
 void TrackerIDSet::Deactivate(int64_t tracker_id) {
   DCHECK_EQ(active_tracker_, tracker_id);
-  DCHECK(ContainsKey(tracker_ids_, tracker_id));
+  DCHECK(base::ContainsKey(tracker_ids_, tracker_id));
   active_tracker_ = 0;
 }