removed some unnecessary stuff from d8's initialization

src/d8-debug.cc

Index: src/d8-debug.cc
diff --git a/src/d8-debug.cc b/src/d8-debug.cc
index 8a3886c676b7524e0a6f99daf92165965f1c094c..06622057b4a487364c305754256cf9f9353fc076 100644
--- a/src/d8-debug.cc
+++ b/src/d8-debug.cc
@@ -272,6 +272,7 @@ RemoteDebuggerEvent* RemoteDebugger::GetEvent() {
 
 
 void RemoteDebugger::HandleMessageReceived(char* message) {
+  Locker lock;
   HandleScope scope;
 
   // Print the event details.
@@ -300,6 +301,7 @@ void RemoteDebugger::HandleMessageReceived(char* message) {
 
 
 void RemoteDebugger::HandleKeyboardCommand(char* command) {
+  Locker lock;
   HandleScope scope;
 
   // Convert the debugger command to a JSON debugger request.