Remove FrameViewBase as base class of RemoteFrameView.

third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 987 matching lines @@
           scrollable_area->ResizerCornerRect(bounds, kResizerForTouch);
       // Map corner to top-frame coords.
       corner = scrollable_area->Box()
                    .LocalToAbsoluteQuad(FloatRect(corner),
                                         kTraverseDocumentBoundaries)
                    .EnclosingBoundingBox();
       should_handle_scroll_gesture_on_main_thread_region.Unite(corner);
     }
   }
 
-  if (const FrameView::PluginsSet* plugins = frame_view->Plugins()) {
-    for (const Member<PluginView>& plugin : *plugins) {
+  for (const auto& child : frame_view->Children()) {
+    if (child->IsPluginView()) {
+      PluginView* plugin = ToPluginView(child);
       if (plugin->WantsWheelEvents()) {
         IntRect box = frame_view->ConvertToRootFrame(plugin->FrameRect());
         should_handle_scroll_gesture_on_main_thread_region.Unite(box);
       }
     }
   }
 
   const FrameTree& tree = frame->Tree();
   for (Frame* sub_frame = tree.FirstChild(); sub_frame;
        sub_frame = sub_frame->Tree().NextSibling()) {
@@ skipping 181 matching lines @@
                                       ->LayerForScrolling())
                      : nullptr) {
     return WebSize(
                frame_view->LayoutViewportScrollableArea()->ContentsSize()) !=
            scroll_layer->Bounds();
   }
   return false;
 }
 
 }  // namespace blink