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

chrome/browser/ui/ash/launcher/chrome_launcher_controller.cc

Index: chrome/browser/ui/ash/launcher/chrome_launcher_controller.cc
diff --git a/chrome/browser/ui/ash/launcher/chrome_launcher_controller.cc b/chrome/browser/ui/ash/launcher/chrome_launcher_controller.cc
index 42554cd472c57fda46efa2a23e1ba806efce5de2..90e23d2be031485abafdbf55a9fcc7f904291fb6 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller.cc
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller.cc
@@ -1364,7 +1364,7 @@ base::string16 ChromeLauncherController::GetAppListTitle(
     std::string app_id = iter->second;
     const extensions::Extension* extension = GetExtensionForAppID(app_id);
     if (extension)
-      return UTF8ToUTF16(extension->name());
+      return base::UTF8ToUTF16(extension->name());
   }
   return l10n_util::GetStringUTF16(IDS_NEW_TAB_TITLE);
 }