Revert of Reland r165710 "Replace RenderFullScreen with top layer"

Source/core/html/HTMLDialogElement.cpp

Index: Source/core/html/HTMLDialogElement.cpp
diff --git a/Source/core/html/HTMLDialogElement.cpp b/Source/core/html/HTMLDialogElement.cpp
index 73b9ff3abb59f47ab3d04a73e3323033f4a332c5..bb8952226746c71671082f012ccf8bb355c19bbb 100644
--- a/Source/core/html/HTMLDialogElement.cpp
+++ b/Source/core/html/HTMLDialogElement.cpp
@@ -94,7 +94,6 @@
     , m_centeringMode(Uninitialized)
     , m_centeredPosition(0)
     , m_returnValue("")
-    , m_modal(false)
 {
     ScriptWrappable::init(this);
 }
@@ -113,13 +112,6 @@
     closeDialog(returnValue);
 }
 
-void HTMLDialogElement::removedFrom(ContainerNode* insertionPoint)
-{
-    // FIXME: We should call inertSubtreesChanged if needed here.
-    m_modal = false;
-    HTMLElement::removedFrom(insertionPoint);
-}
-
 void HTMLDialogElement::closeDialog(const String& returnValue)
 {
     if (!fastHasAttribute(openAttr))
@@ -127,7 +119,6 @@
     setBooleanAttribute(openAttr, false);
 
     HTMLDialogElement* activeModalDialog = document().activeModalDialog();
-    m_modal = false;
     document().removeFromTopLayer(this);
     if (activeModalDialog == this)
         inertSubtreesChanged(document());
@@ -165,7 +156,6 @@
         return;
     }
 
-    m_modal = true;
     document().addToTopLayer(this);
     setBooleanAttribute(openAttr, true);