Delete some unused code found by -Wunused-function

chrome/browser/ui/webui/ntp/app_launcher_handler.cc

Index: chrome/browser/ui/webui/ntp/app_launcher_handler.cc
diff --git a/chrome/browser/ui/webui/ntp/app_launcher_handler.cc b/chrome/browser/ui/webui/ntp/app_launcher_handler.cc
index 6c90c7d6b18b6e90ee58b782d84fc7ad295c3506..10833be363fc17b1f27338790335ffb985190d4a 100644
--- a/chrome/browser/ui/webui/ntp/app_launcher_handler.cc
+++ b/chrome/browser/ui/webui/ntp/app_launcher_handler.cc
@@ -63,23 +63,9 @@ using extensions::CrxInstaller;
 using extensions::Extension;
 using extensions::ExtensionPrefs;
 
-namespace {
-
 const net::UnescapeRule::Type kUnescapeRules =
     net::UnescapeRule::NORMAL | net::UnescapeRule::URL_SPECIAL_CHARS;
 
-extension_misc::AppLaunchBucket ParseLaunchSource(
-    const std::string& launch_source) {
-  int bucket_num = extension_misc::APP_LAUNCH_BUCKET_INVALID;
-  base::StringToInt(launch_source, &bucket_num);
-  extension_misc::AppLaunchBucket bucket =
-      static_cast<extension_misc::AppLaunchBucket>(bucket_num);
-  CHECK(bucket < extension_misc::APP_LAUNCH_BUCKET_BOUNDARY);
-  return bucket;
-}
-
-}  // namespace
-
 AppLauncherHandler::AppInstallInfo::AppInstallInfo() {}
 
 AppLauncherHandler::AppInstallInfo::~AppInstallInfo() {}