Move nullable_string16.h to the string subdirectory.

content/browser/dom_storage/dom_storage_message_filter.h

Index: content/browser/dom_storage/dom_storage_message_filter.h
diff --git a/content/browser/dom_storage/dom_storage_message_filter.h b/content/browser/dom_storage/dom_storage_message_filter.h
index 9bee6d84f62cb4e03e1efd3fb1c9cb73fb48dc8a..cc6ec3523d96ebf2a49786afbc4254f7ed4ed9a6 100644
--- a/content/browser/dom_storage/dom_storage_message_filter.h
+++ b/content/browser/dom_storage/dom_storage_message_filter.h
@@ -12,7 +12,10 @@
 #include "webkit/common/dom_storage/dom_storage_types.h"
 
 class GURL;
+
+namespace base {
 class NullableString16;
+}
 
 namespace dom_storage {
 class DomStorageArea;
@@ -63,7 +66,7 @@ class DOMStorageMessageFilter
       const dom_storage::DomStorageArea* area,
       const string16& key,
       const string16& new_value,
-      const NullableString16& old_value,
+      const base::NullableString16& old_value,
       const GURL& page_url) OVERRIDE;
   virtual void OnDomStorageItemRemoved(
       const dom_storage::DomStorageArea* area,
@@ -77,9 +80,9 @@ class DOMStorageMessageFilter
   void SendDomStorageEvent(
       const dom_storage::DomStorageArea* area,
       const GURL& page_url,
-      const NullableString16& key,
-      const NullableString16& new_value,
-      const NullableString16& old_value);
+      const base::NullableString16& key,
+      const base::NullableString16& new_value,
+      const base::NullableString16& old_value);
 
   scoped_refptr<dom_storage::DomStorageContext> context_;
   scoped_ptr<dom_storage::DomStorageHost> host_;