Reland of place pinch scrollbars with regular scrollbars.

Source/platform/scroll/ScrollbarThemeOverlay.cpp

Index: Source/platform/scroll/ScrollbarThemeOverlay.cpp
diff --git a/Source/platform/scroll/ScrollbarThemeOverlay.cpp b/Source/platform/scroll/ScrollbarThemeOverlay.cpp
index be49135a253f135c5709608882140cc103c273ee..50d06598da7a9969ee74f3fa06445efc91da1e0a 100644
--- a/Source/platform/scroll/ScrollbarThemeOverlay.cpp
+++ b/Source/platform/scroll/ScrollbarThemeOverlay.cpp
@@ -170,4 +170,10 @@
     return ScrollbarTheme::hitTest(scrollbar, position);
 }
 
+ScrollbarTheme* ScrollbarThemeOverlay::mobileTheme()
+{
+    DEFINE_STATIC_LOCAL(ScrollbarThemeOverlay, theme, (3, 3, ScrollbarThemeOverlay::DisallowHitTest, Color(128, 128, 128, 128)));
+    return &theme;
+}
+
 } // namespace blink