Add base:: to string16 in extensions/.

extensions/common/manifest.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 EXTENSIONS_COMMON_MANIFEST_H_
 #define EXTENSIONS_COMMON_MANIFEST_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 131 matching lines @@
   bool is_shared_module() const { return type_ == TYPE_SHARED_MODULE; }
 
   // These access the wrapped manifest value, returning false when the property
   // does not exist or if the manifest type can't access it.
   bool HasKey(const std::string& key) const;
   bool HasPath(const std::string& path) const;
   bool Get(const std::string& path, const base::Value** out_value) const;
   bool GetBoolean(const std::string& path, bool* out_value) const;
   bool GetInteger(const std::string& path, int* out_value) const;
   bool GetString(const std::string& path, std::string* out_value) const;
-  bool GetString(const std::string& path, string16* out_value) const;
+  bool GetString(const std::string& path, base::string16* out_value) const;
   bool GetDictionary(const std::string& path,
                      const base::DictionaryValue** out_value) const;
   bool GetList(const std::string& path,
                const base::ListValue** out_value) const;
 
   // Returns a new Manifest equal to this one, passing ownership to
   // the caller.
   Manifest* DeepCopy() const;
 
   // Returns true if this equals the |other| manifest.
@@ skipping 21 matching lines @@
   scoped_ptr<base::DictionaryValue> value_;
 
   Type type_;
 
   DISALLOW_COPY_AND_ASSIGN(Manifest);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_MANIFEST_H_