storage: Use stl utilities from the base namespace

storage/browser/quota/client_usage_tracker.cc

Index: storage/browser/quota/client_usage_tracker.cc
diff --git a/storage/browser/quota/client_usage_tracker.cc b/storage/browser/quota/client_usage_tracker.cc
index 477fdb5e932ee46e86518756848ff2bbcbaa5ad4..c9c46f6d1a02abd845604ebcc3522add49ec5af7 100644
--- a/storage/browser/quota/client_usage_tracker.cc
+++ b/storage/browser/quota/client_usage_tracker.cc
@@ -46,7 +46,7 @@ bool OriginSetContainsOrigin(const OriginSetByHost& origins,
                              const std::string& host,
                              const GURL& origin) {
   OriginSetByHost::const_iterator itr = origins.find(host);
-  return itr != origins.end() && ContainsKey(itr->second, origin);
+  return itr != origins.end() && base::ContainsKey(itr->second, origin);
 }
 
 void DidGetGlobalUsageForLimitedGlobalUsage(const UsageCallback& callback,
@@ -122,9 +122,9 @@ void ClientUsageTracker::GetGlobalUsage(const GlobalUsageCallback& callback) {
 
 void ClientUsageTracker::GetHostUsage(
     const std::string& host, const UsageCallback& callback) {
-  if (ContainsKey(cached_hosts_, host) &&
-      !ContainsKey(non_cached_limited_origins_by_host_, host) &&
-      !ContainsKey(non_cached_unlimited_origins_by_host_, host)) {
+  if (base::ContainsKey(cached_hosts_, host) &&
+      !base::ContainsKey(non_cached_limited_origins_by_host_, host) &&
+      !base::ContainsKey(non_cached_unlimited_origins_by_host_, host)) {
     // TODO(kinuko): Drop host_usage_map_ cache periodically.
     callback.Run(GetCachedHostUsage(host));
     return;