Remove DebuggerAgent.

src/d8-readline.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 <stdio.h>  // NOLINT
 #include <string.h> // NOLINT
 #include <readline/readline.h> // NOLINT
 #include <readline/history.h> // NOLINT
 
 // The readline includes leaves RETURN defined which breaks V8 compilation.
@@ skipping 65 matching lines @@
 
 
 bool ReadLineEditor::Close() {
   return write_history(kHistoryFileName) == 0;
 }
 
 
 Handle<String> ReadLineEditor::Prompt(const char* prompt) {
   char* result = NULL;
   {  // Release lock for blocking input.
-    Unlocker unlock(Isolate::GetCurrent());
+    Unlocker unlock(isolate_);
     result = readline(prompt);
   }
   if (result == NULL) return Handle<String>();
   AddHistory(result);
   return String::NewFromUtf8(isolate_, result);
 }
 
 
 void ReadLineEditor::AddHistory(const char* str) {
   // Do not record empty input.
@@ skipping 50 matching lines @@
     return strdup(*str);
   } else {
     current_completions.Reset();
     return NULL;
   }
 }
 #endif  // V8_SHARED
 
 
 }  // namespace v8