Move UserScript and related into extensions namespace

chrome/browser/extensions/convert_user_script_unittest.cc

Index: chrome/browser/extensions/convert_user_script_unittest.cc
diff --git a/chrome/browser/extensions/convert_user_script_unittest.cc b/chrome/browser/extensions/convert_user_script_unittest.cc
index cafdbe8d995bdccef1bb3138b6b598a524f81b42..dee24c84637862efc30fb8e37a6664495868b324 100644
--- a/chrome/browser/extensions/convert_user_script_unittest.cc
+++ b/chrome/browser/extensions/convert_user_script_unittest.cc
@@ -16,8 +16,6 @@
 #include "chrome/common/extensions/extension.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using extensions::Extension;
-
 namespace {
 
 static void AddPattern(URLPatternSet* extent, const std::string& pattern) {
@@ -27,6 +25,8 @@ static void AddPattern(URLPatternSet* extent, const std::string& pattern) {
 
 }
 
+namespace extensions {
+
 TEST(ExtensionFromUserScript, Basic) {
   FilePath test_file;
   ASSERT_TRUE(PathService::Get(chrome::DIR_TEST_DATA, &test_file));
@@ -217,3 +217,5 @@ TEST(ExtensionFromUserScript, RunAtDocumentIdle) {
   const UserScript& script = extension->content_scripts()[0];
   EXPECT_EQ(UserScript::DOCUMENT_IDLE, script.run_location());
 }
+
+}  // namespace extensions