Move UserScript and related into extensions namespace

chrome/browser/extensions/user_script_listener_unittest.cc

Index: chrome/browser/extensions/user_script_listener_unittest.cc
diff --git a/chrome/browser/extensions/user_script_listener_unittest.cc b/chrome/browser/extensions/user_script_listener_unittest.cc
index 9eb691a5f48d4ae15f3381564f460db00f99c39e..93d7c0be8e477a52caf8caec308715a90664b32c 100644
--- a/chrome/browser/extensions/user_script_listener_unittest.cc
+++ b/chrome/browser/extensions/user_script_listener_unittest.cc
@@ -23,7 +23,8 @@
 
 using content::ResourceController;
 using content::ResourceThrottle;
-using extensions::Extension;
+
+namespace extensions {
 
 namespace {
 
@@ -151,7 +152,7 @@ class UserScriptListenerTest
         .AppendASCII("Extensions")
         .AppendASCII("behllobkkfkfnphdnhnkndlbkcpglgmj")
         .AppendASCII("1.0.0.0");
-    extensions::UnpackedInstaller::Create(service_)->Load(extension_path);
+    UnpackedInstaller::Create(service_)->Load(extension_path);
   }
 
   void UnloadTestExtension() {
@@ -281,3 +282,5 @@ TEST_F(UserScriptListenerTest, MultiProfile) {
 }
 
 }  // namespace
+
+}  // namespace extensions