[debug] Remove DebugInterface class

src/debug/debug.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 "src/debug/debug.h"
 
 #include <memory>
 
 #include "src/api.h"
 #include "src/arguments.h"
@@ skipping 1818 matching lines @@
                               Handle<Object> exec_state,
                               Handle<Object> event_data,
                               v8::Debug::ClientData* client_data) {
   // Prevent other interrupts from triggering, for example API callbacks,
   // while dispatching event listners.
   PostponeInterruptsScope postpone(isolate_);
   bool previous = in_debug_event_listener_;
   in_debug_event_listener_ = true;
   if (event_listener_->IsForeign()) {
     // Invoke the C debug event listener.
-    v8::DebugInterface::EventCallback callback =
-        FUNCTION_CAST<v8::DebugInterface::EventCallback>(
+    debug::DebugInterface::EventCallback callback =
+        FUNCTION_CAST<debug::DebugInterface::EventCallback>(
             Handle<Foreign>::cast(event_listener_)->foreign_address());
     EventDetailsImpl event_details(event,
                                    Handle<JSObject>::cast(exec_state),
                                    Handle<JSObject>::cast(event_data),
                                    event_listener_data_,
                                    client_data);
     callback(event_details);
     CHECK(!isolate_->has_scheduled_exception());
   } else {
     // Invoke the JavaScript debug event listener.
@@ skipping 658 matching lines @@
   logger_->DebugEvent("Put", message.text());
 }
 
 void LockingCommandMessageQueue::Clear() {
   base::LockGuard<base::Mutex> lock_guard(&mutex_);
   queue_.Clear();
 }
 
 }  // namespace internal
 }  // namespace v8