Move plugins to be stored in HTMLPlugInElement.

third_party/WebKit/Source/core/paint/PartPainter.cpp

Index: third_party/WebKit/Source/core/paint/PartPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/PartPainter.cpp b/third_party/WebKit/Source/core/paint/PartPainter.cpp
index 15736e971c50a412b603685a60486dde7eba23f7..79637ef05808a5dee781ce4ad040170f7405a4ce 100644
--- a/third_party/WebKit/Source/core/paint/PartPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/PartPainter.cpp
@@ -74,6 +74,7 @@ void PartPainter::paint(const PaintInfo& paintInfo,
     // the crashes we see in FrameViewBase painting are due to a destroyed
     // LayoutPart object.
     CHECK(m_layoutPart.node());
+    CHECK(!m_layoutPart.frameViewBase()->isPluginView());
     Optional<RoundedInnerRectClipper> clipper;
     if (m_layoutPart.style()->hasBorderRadius()) {
       if (borderRect.isEmpty())
@@ -120,6 +121,7 @@ void PartPainter::paintContents(const PaintInfo& paintInfo,
 
   FrameViewBase* frameViewBase = m_layoutPart.frameViewBase();
   CHECK(frameViewBase);
+  CHECK(!frameViewBase->isPluginView());
 
   IntPoint paintLocation(roundedIntPoint(
       adjustedPaintOffset + m_layoutPart.replacedContentRect().location()));