Remove FrameViewBase as base class of RemoteFrameView.

third_party/WebKit/Source/modules/plugins/PluginOcclusionSupport.cpp

Index: third_party/WebKit/Source/modules/plugins/PluginOcclusionSupport.cpp
diff --git a/third_party/WebKit/Source/modules/plugins/PluginOcclusionSupport.cpp b/third_party/WebKit/Source/modules/plugins/PluginOcclusionSupport.cpp
index 745a0efe6df96fd6c3d3f19c5114532b932d18af..a3fcc340d8aae42b6108f5f63e17bfd866d0303f 100644
--- a/third_party/WebKit/Source/modules/plugins/PluginOcclusionSupport.cpp
+++ b/third_party/WebKit/Source/modules/plugins/PluginOcclusionSupport.cpp
@@ -154,7 +154,7 @@ static const Element* TopLayerAncestor(const Element* element) {
 // page. In a nutshell, iframe elements should occlude plugins when
 // they occur higher in the stacking order.
 void GetPluginOcclusions(Element* element,
-                         FrameViewBase* parent,
+                         FrameView* parent,
                          const IntRect& frame_rect,
                          Vector<IntRect>& occlusions) {
   LayoutObject* plugin_node = element->GetLayoutObject();
@@ -165,20 +165,12 @@ void GetPluginOcclusions(Element* element,
   Vector<const LayoutObject*> iframe_zstack;
   GetObjectStack(plugin_node, &plugin_zstack);
 
-  if (!parent->IsFrameView())
-    return;
-
-  FrameView* parent_frame_view = ToFrameView(parent);
-
   // Occlusions by iframes.
-  const FrameView::ChildrenSet* children = parent_frame_view->Children();
-  for (FrameView::ChildrenSet::const_iterator it = children->begin();
-       it != children->end(); ++it) {
-    // We only care about FrameView's because iframes show up as FrameViews.
-    if (!(*it)->IsFrameView())
+  for (const auto& child : parent->Children()) {
+    if (!child->IsFrameView())
       continue;
 
-    const FrameView* frame_view = ToFrameView(it->Get());
+    const FrameView* frame_view = ToFrameView(child);
     // Check to make sure we can get both the element and the LayoutObject
     // for this FrameView, if we can't just move on to the next object.
     // FIXME: Plugin occlusion by remote frames is probably broken.
@@ -202,7 +194,7 @@ void GetPluginOcclusions(Element* element,
   // iframe. And a plugin inside an iframe in the top layer won't be respected
   // as being in the top layer.
   const Element* ancestor = TopLayerAncestor(element);
-  Document* document = parent_frame_view->GetFrame().GetDocument();
+  Document* document = parent->GetFrame().GetDocument();
   const HeapVector<Member<Element>>& elements = document->TopLayerElements();
   size_t start = ancestor ? elements.Find(ancestor) + 1 : 0;
   for (size_t i = start; i < elements.size(); ++i)