Fix up static analysis errors introduced by Futures CL.

tools/dom/templates/html/impl/impl_StorageInfo.darttemplate

Index: tools/dom/templates/html/impl/impl_StorageInfo.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_StorageInfo.darttemplate b/tools/dom/templates/html/impl/impl_StorageInfo.darttemplate
new file mode 100644
index 0000000000000000000000000000000000000000..111ce8a4f81ae81a2ae9a19603b64ce45ee4c4b4
--- /dev/null
+++ b/tools/dom/templates/html/impl/impl_StorageInfo.darttemplate
@@ -0,0 +1,29 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+part of $LIBRARYNAME;
+
+$(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
+$!MEMBERS
+  Future<StorageInfoUsage> queryUsageAndQuota(int storageType) {
+    var completer = new Completer<StorageInfoUsage>();
+    _queryUsageAndQuota(storageType,
+        (currentUsageInBytes, currentQuotaInBytes) { 
+          completer.complete(new StorageInfoUsage(currentUsageInBytes, 
+              currentQuotaInBytes));
+        },
+        (error) { completer.completeError(error); });
+    return completer.future;
+  }
+}
+
+/** 
+ * A simple container class for the two values that are returned from the
+ * futures in requestQuota and queryUsageAndQuota.
+ */
+class StorageInfoUsage {
+  final int currentUsageInBytes;
+  final int currentQuotaInBytes;
+  const StorageInfoUsage(this.currentUsageInBytes, this.currentQuotaInBytes);
+}