Move Extension into extensions namespace

chrome/common/extensions/extension_unpacker.h

Index: chrome/common/extensions/extension_unpacker.h
diff --git a/chrome/common/extensions/extension_unpacker.h b/chrome/common/extensions/extension_unpacker.h
index 5c6c14c69fcbc67ef54d51dd519301d49244e46b..5fd73984821851501e3a3e0eef80efec6f822137 100644
--- a/chrome/common/extensions/extension_unpacker.h
+++ b/chrome/common/extensions/extension_unpacker.h
@@ -30,7 +30,7 @@ class ExtensionUnpacker {
 
   ExtensionUnpacker(const FilePath& extension_path,
                     const std::string& extension_id,
-                    Extension::Location location,
+                    extensions::Extension::Location location,
                     int creation_flags);
   ~ExtensionUnpacker();
 
@@ -93,7 +93,7 @@ class ExtensionUnpacker {
   std::string extension_id_;
 
   // The location to use for the created extension.
-  Extension::Location location_;
+  extensions::Extension::Location location_;
 
   // The creation flags to use with the created extension.
   int creation_flags_;