Not creating ClientUsageTracker for unsupported storage type.

webkit/browser/quota/usage_tracker.cc

Index: webkit/browser/quota/usage_tracker.cc
diff --git a/webkit/browser/quota/usage_tracker.cc b/webkit/browser/quota/usage_tracker.cc
index 4bf64880c3caa2db1b89d8c872ee73d17acbcf6e..57b5e0d24eacd11c9eb7670928deedfe6d5f6f2e 100644
--- a/webkit/browser/quota/usage_tracker.cc
+++ b/webkit/browser/quota/usage_tracker.cc
@@ -78,8 +78,10 @@ UsageTracker::UsageTracker(const QuotaClientList& clients,
   for (QuotaClientList::const_iterator iter = clients.begin();
       iter != clients.end();
       ++iter) {
-    client_tracker_map_[(*iter)->id()] =
-        new ClientUsageTracker(this, *iter, type, special_storage_policy);
+    if ((*iter)->DoesSupport(type)) {
+      client_tracker_map_[(*iter)->id()] =
+          new ClientUsageTracker(this, *iter, type, special_storage_policy);
+    }
   }
 }