Move Extension into extensions namespace

chrome/common/extensions/extension_file_util.h

Index: chrome/common/extensions/extension_file_util.h
diff --git a/chrome/common/extensions/extension_file_util.h b/chrome/common/extensions/extension_file_util.h
index 1ad1120c6dd16da4811a12798d1eb1cf271d565f..96f38fb11699ec7e9fade285b9c4aa3a8b196fc0 100644
--- a/chrome/common/extensions/extension_file_util.h
+++ b/chrome/common/extensions/extension_file_util.h
@@ -12,7 +12,6 @@
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_message_bundle.h"
 
-class Extension;
 class ExtensionMessageBundle;
 class FilePath;
 class GURL;
@@ -41,17 +40,19 @@ void UninstallExtension(const FilePath& extensions_dir,
 
 // Loads and validates an extension from the specified directory. Returns NULL
 // on failure, with a description of the error in |error|.
-scoped_refptr<Extension> LoadExtension(const FilePath& extension_root,
-                                       Extension::Location location,
-                                       int flags,
-                                       std::string* error);
+scoped_refptr<extensions::Extension> LoadExtension(
+    const FilePath& extension_root,
+    extensions::Extension::Location location,
+    int flags,
+    std::string* error);
 
 // The same as LoadExtension except use the provided |extension_id|.
-scoped_refptr<Extension> LoadExtension(const FilePath& extension_root,
-                                       const std::string& extension_id,
-                                       Extension::Location location,
-                                       int flags,
-                                       std::string* error);
+scoped_refptr<extensions::Extension> LoadExtension(
+    const FilePath& extension_root,
+    const std::string& extension_id,
+    extensions::Extension::Location location,
+    int flags,
+    std::string* error);
 
 // Loads an extension manifest from the specified directory. Returns NULL
 // on failure, with a description of the error in |error|.
@@ -60,7 +61,8 @@ base::DictionaryValue* LoadManifest(const FilePath& extension_root,
 
 // Returns true if the given extension object is valid and consistent.
 // Otherwise, a description of the error is returned in |error|.
-bool ValidateExtension(const Extension* extension, std::string* error);
+bool ValidateExtension(const extensions::Extension* extension,
+                       std::string* error);
 
 // Cleans up the extension install directory. It can end up with garbage in it
 // if extensions can't initially be removed when they are uninstalled (eg if a