Remove unused fields found by clang's new Wunused-private-fields.

ppapi/examples/flash_topmost/flash_topmost.cc

 // Copyright (c) 2012 The Chromium 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 "ppapi/cpp/graphics_2d.h"
 #include "ppapi/cpp/image_data.h"
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/logging.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/cpp/private/flash.h"
@@ skipping 91 matching lines @@
     for (int y = rect.y(); y < rect.y() + rect.height(); y++) {
       *image.GetAddr32(pp::Point(rect.x(), y)) = 0xff202020;
       *image.GetAddr32(pp::Point(rect.x() + rect.width() - 1, y)) = 0xff202020;
     }
 
     return image;
   }
 
   pp::CompletionCallbackFactory<MyInstance> callback_factory_;
 
-  int32_t timer_interval_;
-
   // Painting stuff.
   pp::Size size_;
   pp::Graphics2D device_context_;
   bool pending_paint_;
   bool waiting_for_flush_completion_;
 };
 
 class MyModule : public pp::Module {
  public:
   virtual pp::Instance* CreateInstance(PP_Instance instance) {
     return new MyInstance(instance);
   }
 };
 
 namespace pp {
 
 // Factory function for your specialization of the Module object.
 Module* CreateModule() {
   return new MyModule();
 }
 
 }  // namespace pp