Remove support for Javascript warnings in the VM.

runtime/lib/timeline.cc

Index: runtime/lib/timeline.cc
diff --git a/runtime/lib/timeline.cc b/runtime/lib/timeline.cc
index 51319d7de03e867460f73383a30d611a4389837c..ddc2f5a7367b1a1e9891ae87691610a4d6c1c037 100644
--- a/runtime/lib/timeline.cc
+++ b/runtime/lib/timeline.cc
@@ -16,9 +16,7 @@ namespace dart {
 // Native implementations for the dart:developer library.
 
 DEFINE_NATIVE_ENTRY(Timeline_getIsolateNum, 0) {
-  return Integer::New(static_cast<int64_t>(isolate->main_port()),
-                      Heap::kOld,
-                      true);
+  return Integer::New(static_cast<int64_t>(isolate->main_port()), Heap::kOld);
 }
 
 
@@ -35,7 +33,7 @@ DEFINE_NATIVE_ENTRY(Timeline_getNextAsyncId, 0) {
 
 
 DEFINE_NATIVE_ENTRY(Timeline_getTraceClock, 0) {
-  return Integer::New(OS::GetCurrentMonotonicMicros(), Heap::kNew, true);
+  return Integer::New(OS::GetCurrentMonotonicMicros(), Heap::kNew);
 }