Fix RTL scroll bars being misrendered on Android.

Source/core/platform/Scrollbar.h

Index: Source/core/platform/Scrollbar.h
diff --git a/Source/core/platform/Scrollbar.h b/Source/core/platform/Scrollbar.h
index 97df42ff8b96bb7cbaeeb77bd4f0575dfccee94b..f8de1fa6a2dc5680c5d9c8eba3f1bc3bac7bbb7e 100644
--- a/Source/core/platform/Scrollbar.h
+++ b/Source/core/platform/Scrollbar.h
@@ -30,7 +30,6 @@
 #include "core/platform/ScrollbarThemeClient.h"
 #include "core/platform/Timer.h"
 #include "core/platform/Widget.h"
-#include "core/platform/text/TextDirection.h"
 #include "wtf/MathExtras.h"
 #include "wtf/PassRefPtr.h"
 
@@ -77,7 +76,7 @@ public:
 
     virtual bool isCustomScrollbar() const { return false; }
     virtual ScrollbarOrientation orientation() const { return m_orientation; }
-    TextDirection textDirection() const;
+    virtual bool isLeftSideVerticalScrollbar() const;
 
     virtual int value() const { return lroundf(m_currentPos); }
     virtual float currentPos() const { return m_currentPos; }