Update some uses of UTF conversions in chrome/browser to use the base:: namespace.

chrome/browser/shell_integration_win_unittest.cc

Index: chrome/browser/shell_integration_win_unittest.cc
diff --git a/chrome/browser/shell_integration_win_unittest.cc b/chrome/browser/shell_integration_win_unittest.cc
index 2c63b5c30d6e14558d156dbaf66e13e02ef28866..fc432ff030804e1663418ce31d652cf3067f8d9b 100644
--- a/chrome/browser/shell_integration_win_unittest.cc
+++ b/chrome/browser/shell_integration_win_unittest.cc
@@ -67,8 +67,8 @@ class ShellIntegrationWinMigrateShortcutTest : public testing::Test {
 
     extension_id_ = L"chromiumexampleappidforunittests";
     base::string16 app_name =
-        UTF8ToUTF16(web_app::GenerateApplicationNameFromExtensionId(
-        UTF16ToUTF8(extension_id_)));
+        base::UTF8ToUTF16(web_app::GenerateApplicationNameFromExtensionId(
+        base::UTF16ToUTF8(extension_id_)));
     extension_app_id_ =
         ShellIntegration::GetAppModelIdForProfile(app_name,
                                                   default_profile_path);