[debug] Remove DebugInterface class

src/debug/debug.cc

Index: src/debug/debug.cc
diff --git a/src/debug/debug.cc b/src/debug/debug.cc
index c8db633f7c3aa30b1b5ebd8ab8f2a60e01e7e1d3..db2ccf71848065387009d2ff10b62efffbd17da7 100644
--- a/src/debug/debug.cc
+++ b/src/debug/debug.cc
@@ -1836,9 +1836,8 @@ void Debug::CallEventCallback(v8::DebugEvent event,
   in_debug_event_listener_ = true;
   if (event_listener_->IsForeign()) {
     // Invoke the C debug event listener.
-    v8::DebugInterface::EventCallback callback =
-        FUNCTION_CAST<v8::DebugInterface::EventCallback>(
-            Handle<Foreign>::cast(event_listener_)->foreign_address());
+    debug::EventCallback callback = FUNCTION_CAST<debug::EventCallback>(
+        Handle<Foreign>::cast(event_listener_)->foreign_address());
     EventDetailsImpl event_details(event,
                                    Handle<JSObject>::cast(exec_state),
                                    Handle<JSObject>::cast(event_data),