Add base:: to string16 in extensions/.

extensions/common/manifest_handlers/requirements_info.cc

 // 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.
 
 #include "extensions/common/manifest_handlers/requirements_info.h"
 
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
@@ skipping 42 matching lines @@
 }
 
 const std::vector<std::string> RequirementsHandler::Keys() const {
   return SingleKey(keys::kRequirements);
 }
 
 bool RequirementsHandler::AlwaysParseForType(Manifest::Type type) const {
   return true;
 }
 
-bool RequirementsHandler::Parse(Extension* extension, string16* error) {
+bool RequirementsHandler::Parse(Extension* extension, base::string16* error) {
   scoped_ptr<RequirementsInfo> requirements(
       new RequirementsInfo(extension->manifest()));
 
   if (!extension->manifest()->HasKey(keys::kRequirements)) {
     extension->SetManifestData(keys::kRequirements, requirements.release());
     return true;
   }
 
   const base::DictionaryValue* requirements_value = NULL;
   if (!extension->manifest()->GetDictionary(keys::kRequirements,
@@ skipping 58 matching lines @@
       *error = ASCIIToUTF16(errors::kInvalidRequirements);
       return false;
     }
   }
 
   extension->SetManifestData(keys::kRequirements, requirements.release());
   return true;
 }
 
 }  // namespace extensions