Remove support for Object.observe

test/cctest/test-debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 7864 matching lines @@
   CompileRun(
       "var r;"
       "p.chain(function() { r = 'resolved'; },"
       "        function(e) { r = 'rejected' + e; });");
   CHECK(
       CompileRun("r")->Equals(context, v8_str("rejectedrejection")).FromJust());
   CHECK_EQ(1, exception_event_counter);
 }
 
 
-TEST(DebugBreakOnExceptionInObserveCallback) {
-  i::FLAG_harmony_object_observe = true;
-  DebugLocalContext env;
-  v8::Isolate* isolate = env->GetIsolate();
-  v8::HandleScope scope(isolate);
-  v8::Debug::SetDebugEventListener(isolate, &DebugEventCountException);
-  v8::Local<v8::Context> context = env.context();
-  // Break on uncaught exception
-  ChangeBreakOnException(false, true);
-  exception_event_counter = 0;
-
-  v8::Local<v8::FunctionTemplate> fun =
-      v8::FunctionTemplate::New(isolate, ThrowCallback);
-  CHECK(env->Global()
-            ->Set(context, v8_str("fun"),
-                  fun->GetFunction(context).ToLocalChecked())
-            .FromJust());
-
-  CompileRun(
-      "var obj = {};"
-      "var callbackRan = false;"
-      "Object.observe(obj, function() {"
-      "   callbackRan = true;"
-      "   throw Error('foo');"
-      "});"
-      "obj.prop = 1");
-  CHECK(CompileRun("callbackRan")->BooleanValue(context).FromJust());
-  CHECK_EQ(1, exception_event_counter);
-}
-
-
 static void DebugHarmonyScopingListener(
     const v8::Debug::EventDetails& event_details) {
   v8::DebugEvent event = event_details.GetEvent();
   if (event != v8::Break) return;
 
   int break_id = CcTest::i_isolate()->debug()->break_id();
 
   char script[128];
   i::Vector<char> script_vector(script, sizeof(script));
   SNPrintF(script_vector, "%%GetFrameCount(%d)", break_id);
@@ skipping 285 matching lines @@
       "function foo() {\n"
       "  try { throw new Error(); } catch (e) {}\n"
       "}\n"
       "debugger;\n"
       "foo();\n"
       "foo();\n");
 
   v8::Debug::SetDebugEventListener(env->GetIsolate(), nullptr);
   CHECK_EQ(break_point_hit_count, 4);
 }