PPAPI: Remove threading options; it's always on

ppapi/proxy/ppp_instance_private_proxy_unittest.cc

Index: ppapi/proxy/ppp_instance_private_proxy_unittest.cc
diff --git a/ppapi/proxy/ppp_instance_private_proxy_unittest.cc b/ppapi/proxy/ppp_instance_private_proxy_unittest.cc
index df1af0ccf0744e7f8448394856ff834ed4d1b954..317f4d4b7f709261dbd3d1352f656990018d1474 100644
--- a/ppapi/proxy/ppp_instance_private_proxy_unittest.cc
+++ b/ppapi/proxy/ppp_instance_private_proxy_unittest.cc
@@ -147,15 +147,7 @@ class PPP_Instance_Private_ProxyTest : public TwoWayTest {
 
 }  // namespace
 
-// TODO(raymes): This #ifdef is only here because we check the state of the
-// plugin globals on the main thread, rather than the plugin thread which causes
-// the thread checker to fail. Once ENABLE_PEPPER_THREADING is the default,
-// this will be safe to do anyway, so we can remove this.
-#ifdef ENABLE_PEPPER_THREADING
 TEST_F(PPP_Instance_Private_ProxyTest, PPPInstancePrivate) {
-#else
-TEST_F(PPP_Instance_Private_ProxyTest, DISABLED_PPPInstancePrivate) {
-#endif
   // This test controls its own instance; we can't use the one that
   // PluginProxyTestHarness provides.
   ASSERT_NE(kInstance, pp_instance());