Replace base::NullableString16(bool) usage with default constructor.

webkit/browser/dom_storage/dom_storage_host.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "webkit/browser/dom_storage/dom_storage_host.h"
 
 #include "googleurl/src/gurl.h"
 #include "webkit/browser/dom_storage/dom_storage_area.h"
 #include "webkit/browser/dom_storage/dom_storage_context.h"
 #include "webkit/browser/dom_storage/dom_storage_namespace.h"
@@ skipping 66 matching lines @@
   DomStorageArea* area = GetOpenArea(connection_id);
   if (!area)
     return 0;
   return area->Length();
 }
 
 base::NullableString16 DomStorageHost::GetAreaKey(int connection_id,
                                                   unsigned index) {
   DomStorageArea* area = GetOpenArea(connection_id);
   if (!area)
-    return base::NullableString16(true);
+    return base::NullableString16();
   return area->Key(index);
 }
 
 base::NullableString16 DomStorageHost::GetAreaItem(int connection_id,
                                                    const base::string16& key) {
   DomStorageArea* area = GetOpenArea(connection_id);
   if (!area)
-    return base::NullableString16(true);
+    return base::NullableString16();
   return area->GetItem(key);
 }
 
 bool DomStorageHost::SetAreaItem(
     int connection_id, const base::string16& key,
     const base::string16& value, const GURL& page_url,
     base::NullableString16* old_value) {
   DomStorageArea* area = GetOpenArea(connection_id);
   if (!area) {
     // TODO(michaeln): Fix crbug/134003 and return false here.
@@ skipping 55 matching lines @@
     return NULL;
   return found->second.namespace_.get();
 }
 
 // NamespaceAndArea
 
 DomStorageHost::NamespaceAndArea::NamespaceAndArea() {}
 DomStorageHost::NamespaceAndArea::~NamespaceAndArea() {}
 
 }  // namespace dom_storage