[debugger] do not enable liveedit by default.

src/d8.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
 
 #include <algorithm>
@@ skipping 2012 matching lines @@
 
     Local<Value> function =
         FunctionTemplate::New(isolate_, SendInspectorMessage)
             ->GetFunction(context)
             .ToLocalChecked();
     Local<String> function_name =
         String::NewFromUtf8(isolate_, "send", NewStringType::kNormal)
             .ToLocalChecked();
     CHECK(context->Global()->Set(context, function_name, function).FromJust());
 
+    v8::debug::SetLiveEditEnabled(isolate_, true);
+
     context_.Reset(isolate_, context);
   }
 
  private:
   static v8_inspector::V8InspectorSession* GetSession(Local<Context> context) {
     InspectorClient* inspector_client = static_cast<InspectorClient*>(
         context->GetAlignedPointerFromEmbedderData(kInspectorClientIndex));
     return inspector_client->session_.get();
   }
 
@@ skipping 990 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif