Revert of Expose scroll customization for touch to JS (behind REF).

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index a8298d550b248455ee359cf3e570fbaad9500851..97c67e97f9681154bdc4bcdccef101d4a03609bd 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -115,7 +115,6 @@
 #include "core/page/NetworkStateNotifier.h"
 #include "core/page/Page.h"
 #include "core/page/PrintContext.h"
-#include "core/page/scrolling/ScrollState.h"
 #include "core/paint/DeprecatedPaintLayer.h"
 #include "core/plugins/testing/DictionaryPluginPlaceholder.h"
 #include "core/plugins/testing/DocumentFragmentPluginPlaceholder.h"
@@ -2407,15 +2406,6 @@
     toHTMLPlugInElement(element)->setPlaceholder(DictionaryPluginPlaceholder::create(element->document(), options));
 }
 
-void Internals::setScrollChain(
-    ScrollState* scrollState, const WillBeHeapVector<RefPtrWillBeMember<Element>>& elements, ExceptionState&)
-{
-    WillBeHeapDeque<RefPtrWillBeMember<Element>> scrollChain;
-    for (size_t i = 0; i < elements.size(); ++i)
-        scrollChain.append(elements[i]);
-    scrollState->setScrollChain(scrollChain);
-}
-
 void Internals::forceBlinkGCWithoutV8GC()
 {
     ThreadState::current()->setGCState(ThreadState::FullGCScheduled);