Experiment: retire Oilpan disposal of persisted plugin widgets.

third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp b/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp
index 7692c9c0c9a7fba0788e01aff8adb4d620af7099..4272b022eeaf99a34a47d990d7b3bd024dad346a 100644
--- a/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp
@@ -181,16 +181,6 @@ void HTMLFrameOwnerElement::disconnectContentFrame()
     if (RefPtrWillBeRawPtr<Frame> frame = contentFrame()) {
         frame->detach(FrameDetachType::Remove);
     }
-#if ENABLE(OILPAN)
-    // Oilpan: a plugin container must be explicitly disposed before it
-    // is swept and finalized. This is because the underlying plugin needs
-    // to be able to access a fully-functioning frame (and all it refers
-    // to) while it destructs and cleans out its resources.
-    if (m_widget) {
-        m_widget->dispose();
-        m_widget = nullptr;
-    }
-#endif
 }
 
 HTMLFrameOwnerElement::~HTMLFrameOwnerElement()