Move Extension into extensions namespace

chrome/browser/extensions/test_extension_prefs.h

Index: chrome/browser/extensions/test_extension_prefs.h
diff --git a/chrome/browser/extensions/test_extension_prefs.h b/chrome/browser/extensions/test_extension_prefs.h
index 25862dd42669da0b238c11fd780f436aa4ac4521..dc35c42b0e06adcccebc075e707377b40743a5ae 100644
--- a/chrome/browser/extensions/test_extension_prefs.h
+++ b/chrome/browser/extensions/test_extension_prefs.h
@@ -38,20 +38,21 @@ class TestExtensionPrefs {
 
   // Creates a new Extension with the given name in our temp dir, adds it to
   // our ExtensionPrefs, and returns it.
-  scoped_refptr<Extension> AddExtension(std::string name);
+  scoped_refptr<extensions::Extension> AddExtension(std::string name);
 
   // As above, but the extension is an app.
-  scoped_refptr<Extension> AddApp(std::string name);
+  scoped_refptr<extensions::Extension> AddApp(std::string name);
 
   // Similar to AddExtension, but takes a dictionary with manifest values.
-  scoped_refptr<Extension> AddExtensionWithManifest(
-      const base::DictionaryValue& manifest, Extension::Location location);
+  scoped_refptr<extensions::Extension> AddExtensionWithManifest(
+      const base::DictionaryValue& manifest,
+      extensions::Extension::Location location);
 
   // Similar to AddExtension, but takes a dictionary with manifest values
   // and extension flags.
-  scoped_refptr<Extension> AddExtensionWithManifestAndFlags(
+  scoped_refptr<extensions::Extension> AddExtensionWithManifestAndFlags(
       const base::DictionaryValue& manifest,
-      Extension::Location location,
+      extensions::Extension::Location location,
       int extra_flags);
 
   // Similar to AddExtension, this adds a new test Extension. This is useful for