Kiss goodbye to MaybeObject.

src/incremental-marking-inl.h

Index: src/incremental-marking-inl.h
diff --git a/src/incremental-marking-inl.h b/src/incremental-marking-inl.h
index 1762f2be139746fe6b2651698f4c994f22253677..19d471c36754f4e51f5849a0a4e702f8efabe4c0 100644
--- a/src/incremental-marking-inl.h
+++ b/src/incremental-marking-inl.h
@@ -45,7 +45,7 @@ bool IncrementalMarking::BaseRecordWrite(HeapObject* obj,
 void IncrementalMarking::RecordWrite(HeapObject* obj,
                                      Object** slot,
                                      Object* value) {
-  if (IsMarking() && value->NonFailureIsHeapObject()) {
+  if (IsMarking() && value->IsHeapObject()) {
     RecordWriteSlow(obj, slot, value);
   }
 }
@@ -61,7 +61,7 @@ void IncrementalMarking::RecordWriteOfCodeEntry(JSFunction* host,
 void IncrementalMarking::RecordWriteIntoCode(HeapObject* obj,
                                              RelocInfo* rinfo,
                                              Object* value) {
-  if (IsMarking() && value->NonFailureIsHeapObject()) {
+  if (IsMarking() && value->IsHeapObject()) {
     RecordWriteIntoCodeSlow(obj, rinfo, value);
   }
 }