Check for FLAG_enable_liveedit when using Live Edit.

src/debug.h

 // 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 857 matching lines @@
     return !compiling_natives_ && Debugger::IsDebuggerActive();
   }
 
   void set_compiling_natives(bool compiling_natives) {
     compiling_natives_ = compiling_natives;
   }
   bool compiling_natives() const { return compiling_natives_; }
   void set_loading_debugger(bool v) { is_loading_debugger_ = v; }
   bool is_loading_debugger() const { return is_loading_debugger_; }
   void set_live_edit_enabled(bool v) { live_edit_enabled_ = v; }
-  bool live_edit_enabled() const { return live_edit_enabled_; }
+  bool live_edit_enabled() const {
+    return FLAG_enable_liveedit && live_edit_enabled_ ;
+  }
   void set_force_debugger_active(bool force_debugger_active) {
     force_debugger_active_ = force_debugger_active;
   }
   bool force_debugger_active() const { return force_debugger_active_; }
 
   bool IsDebuggerActive();
 
  private:
   explicit Debugger(Isolate* isolate);
 
@@ skipping 152 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(MessageDispatchHelperThread);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 #endif  // V8_DEBUG_H_