Remove PerBrowser launcher

ash/test/test_launcher_delegate.cc

Index: ash/test/test_launcher_delegate.cc
diff --git a/ash/test/test_launcher_delegate.cc b/ash/test/test_launcher_delegate.cc
index 0830d322ed0240af26503c0304f9c7f6111d4fe3..ed3e517b91aa6b1acf495db748b37dfe13882d9e 100644
--- a/ash/test/test_launcher_delegate.cc
+++ b/ash/test/test_launcher_delegate.cc
@@ -126,10 +126,6 @@ void TestLauncherDelegate::OnLauncherCreated(Launcher* launcher) {
 void TestLauncherDelegate::OnLauncherDestroyed(Launcher* launcher) {
 }
 
-bool TestLauncherDelegate::IsPerAppLauncher() {
-  return true;
-}
-
 LauncherID TestLauncherDelegate::GetLauncherIDForAppID(
     const std::string& app_id) {
   return 0;