Remove FrameViewBase as base class of PluginView.

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index b264822119ba8bac4c538b5c09d5e0abd6d23a6e..291da1549eeed5ac9fe58250a08ccd51c882abeb 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -1503,9 +1503,8 @@ void FrameView::UpdateGeometries() {
     if (GetLayoutViewItem().IsNull())
       break;
 
-    if (FrameViewBase* frame_view_base = part->PluginOrFrame()) {
-      if (frame_view_base->IsFrameView()) {
-        FrameView* frame_view = ToFrameView(frame_view_base);
+    if (part->GetFrameOrPlugin()) {
+      if (FrameView* frame_view = part->ChildFrameView()) {
         bool did_need_layout = frame_view->NeedsLayout();
         part->UpdateGeometry();
         if (!did_need_layout && !frame_view->ShouldThrottleRendering())