Pass --harmony-object-observe in tests that depend on it

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index bd26f9277b4ad4d5142ad6e8daf65e5f264b582a..a282aad7a1006b3a629b1cf778e2e290d25b8c1e 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -8772,6 +8772,7 @@ TEST(ApiUncaughtException) {
 
 
 TEST(ApiUncaughtExceptionInObjectObserve) {
+  v8::internal::FLAG_harmony_object_observe = true;
   v8::internal::FLAG_stack_size = 150;
   report_count = 0;
   LocalContext env;
@@ -20137,6 +20138,7 @@ static void DebugEventInObserver(const v8::Debug::EventDetails& event_details) {
 
 
 TEST(Regress385349) {
+  i::FLAG_harmony_object_observe = true;
   i::FLAG_allow_natives_syntax = true;
   v8::Isolate* isolate = CcTest::isolate();
   HandleScope handle_scope(isolate);