Remove FrameViewBase as base class of RemoteFrameView.

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

Index: third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp
diff --git a/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp b/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp
index be89186618379733becce7107e6ef7f3e41ab966..d06b8c13aa79086e0c7794132847ad34fae24188 100644
--- a/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp
+++ b/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp
@@ -1005,8 +1005,9 @@ Region ScrollingCoordinator::ComputeShouldHandleScrollGestureOnMainThreadRegion(
     }
   }
 
-  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);