Add base:: to string16 in extensions/.

extensions/common/permissions/permission_message.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_PERMISSIONS_PERMISSION_MESSAGE_H_
 #define EXTENSIONS_COMMON_PERMISSIONS_PERMISSION_MESSAGE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 68 matching lines @@
     kStartupPages,
     kMediaGalleriesAllGalleriesDelete,
     kScreenlockPrivate,
     kHideBookmarkButton,
     kEnumBoundary,
   };
   COMPILE_ASSERT(PermissionMessage::kNone > PermissionMessage::kUnknown,
                  kNone_not_greater_than_kUnknown);
 
   // Creates the corresponding permission message.
-  PermissionMessage(ID id, const string16& message);
-  PermissionMessage(ID id, const string16& message, const string16& details);
+  PermissionMessage(ID id, const base::string16& message);
+  PermissionMessage(ID id,
+                    const base::string16& message,
+                    const base::string16& details);
   ~PermissionMessage();
 
   // Gets the id of the permission message, which can be used in UMA
   // histograms.
   ID id() const { return id_; }
 
   // Gets a localized message describing this permission. Please note that
   // the message will be empty for message types TYPE_NONE and TYPE_UNKNOWN.
-  const string16& message() const { return message_; }
+  const base::string16& message() const { return message_; }
 
   // Gets a localized message describing the details for this permission. Please
   // note that the message will be empty for message types TYPE_NONE and
   // TYPE_UNKNOWN.
-  const string16& details() const { return details_; }
+  const base::string16& details() const { return details_; }
 
   // Comparator to work with std::set.
   bool operator<(const PermissionMessage& that) const {
     return id_ < that.id_;
   }
   // Comparator to work with base::STLSetDifference.
   bool operator>(const PermissionMessage& that) const {
     return id_ > that.id_;
   }
 
  private:
   ID id_;
-  string16 message_;
-  string16 details_;
+  base::string16 message_;
+  base::string16 details_;
 };
 
 typedef std::vector<PermissionMessage> PermissionMessages;
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_PERMISSIONS_PERMISSION_MESSAGE_H_