Fold ScrollingCoordinatorChromium into ScrollingCoordinator and devirtualize

Source/WebCore/testing/Internals.cpp

Index: Source/WebCore/testing/Internals.cpp
diff --git a/Source/WebCore/testing/Internals.cpp b/Source/WebCore/testing/Internals.cpp
index 8dd36d6352ec0ad75674c9d89898d1f30ca7bbc7..2bd2c2ac3b616f10df3e27f561dded49d5839ee0 100644
--- a/Source/WebCore/testing/Internals.cpp
+++ b/Source/WebCore/testing/Internals.cpp
@@ -1693,16 +1693,7 @@ String Internals::repaintRectsAsText(Document* document, ExceptionCode& ec) cons
 
 String Internals::scrollingStateTreeAsText(Document* document, ExceptionCode& ec) const
 {
-    if (!document || !document->frame()) {
-        ec = INVALID_ACCESS_ERR;
-        return String();
-    }
-
-    Page* page = document->page();
-    if (!page)
-        return String();
-
-    return page->scrollingStateTreeAsText();
+    return String();
 }
 
 String Internals::mainThreadScrollingReasons(Document* document, ExceptionCode& ec) const