first step to remove unsafe handles

src/d8-debug.cc

Index: src/d8-debug.cc
diff --git a/src/d8-debug.cc b/src/d8-debug.cc
index a20de43b760c840fcae6a8718cc701c633ed651b..e1d29d98efb812b1d861fb115754c3e084b7c724 100644
--- a/src/d8-debug.cc
+++ b/src/d8-debug.cc
@@ -77,7 +77,7 @@ void HandleDebugEvent(DebugEvent event,
 
   // Print the event details.
   Handle<Object> details =
-      Shell::DebugMessageDetails(Handle<String>::Cast(event_json));
+      Shell::DebugMessageDetails(isolate, Handle<String>::Cast(event_json));
   if (try_catch.HasCaught()) {
     Shell::ReportException(isolate, &try_catch);
     return;
@@ -114,7 +114,7 @@ void HandleDebugEvent(DebugEvent event,
 
     // Convert the debugger command to a JSON debugger request.
     Handle<Value> request =
-        Shell::DebugCommandToJSONRequest(String::New(command));
+        Shell::DebugCommandToJSONRequest(isolate, String::New(command));
     if (try_catch.HasCaught()) {
       Shell::ReportException(isolate, &try_catch);
       continue;
@@ -146,7 +146,8 @@ void HandleDebugEvent(DebugEvent event,
     Handle<String> response = Handle<String>::Cast(response_val);
 
     // Convert the debugger response into text details and the running state.
-    Handle<Object> response_details = Shell::DebugMessageDetails(response);
+    Handle<Object> response_details =
+        Shell::DebugMessageDetails(isolate, response);
     if (try_catch.HasCaught()) {
       Shell::ReportException(isolate, &try_catch);
       continue;
@@ -281,7 +282,8 @@ void RemoteDebugger::HandleMessageReceived(char* message) {
   // Print the event details.
   TryCatch try_catch;
   Handle<Object> details =
-      Shell::DebugMessageDetails(Handle<String>::Cast(String::New(message)));
+      Shell::DebugMessageDetails(isolate_,
+                                 Handle<String>::Cast(String::New(message)));
   if (try_catch.HasCaught()) {
     Shell::ReportException(isolate_, &try_catch);
     PrintPrompt();
@@ -310,7 +312,7 @@ void RemoteDebugger::HandleKeyboardCommand(char* command) {
   // Convert the debugger command to a JSON debugger request.
   TryCatch try_catch;
   Handle<Value> request =
-      Shell::DebugCommandToJSONRequest(String::New(command));
+      Shell::DebugCommandToJSONRequest(isolate_, String::New(command));
   if (try_catch.HasCaught()) {
     Shell::ReportException(isolate_, &try_catch);
     PrintPrompt();