Add explicit base namespace to string16 users.

chrome/common/extensions/api/sockets/sockets_manifest_permission.h

 // Copyright 2013 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.
 
 #ifndef CHROME_COMMON_EXTENSIONS_API_SOCKETS_SOCKETS_MANIFEST_PERMISSION_H_
 #define CHROME_COMMON_EXTENSIONS_API_SOCKETS_SOCKETS_MANIFEST_PERMISSION_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 14 matching lines @@
 class SocketsManifestPermission : public ManifestPermission {
  public:
   typedef std::set<SocketPermissionEntry> SocketPermissionEntrySet;
   SocketsManifestPermission();
   virtual ~SocketsManifestPermission();
 
   // Tries to construct the info based on |value|, as it would have appeared in
   // the manifest. Sets |error| and returns an empty scoped_ptr on failure.
   static scoped_ptr<SocketsManifestPermission> FromValue(
       const base::Value& value,
-      string16* error);
+      base::string16* error);
 
   bool CheckRequest(const Extension* extension,
                     const content::SocketPermissionRequest& request) const;
 
   void AddPermission(const SocketPermissionEntry& entry);
 
   // extensions::ManifestPermission overrides.
   virtual std::string name() const OVERRIDE;
   virtual std::string id() const OVERRIDE;
   virtual bool HasMessages() const OVERRIDE;
@@ skipping 20 matching lines @@
   void AddSubdomainHostMessage(PermissionMessages& messages) const;
   void AddSpecificHostMessage(PermissionMessages& messages) const;
   void AddNetworkListMessage(PermissionMessages& messages) const;
 
   SocketPermissionEntrySet permissions_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_API_SOCKETS_SOCKETS_MANIFEST_PERMISSION_H_