Cleanup ScrollableArea scrolling API

Source/platform/scroll/ScrollTypes.h

Index: Source/platform/scroll/ScrollTypes.h
diff --git a/Source/platform/scroll/ScrollTypes.h b/Source/platform/scroll/ScrollTypes.h
index c3a75baaf8d7347e88f2edb27db4f96257cb6f3e..73b7caba7833ae6358c46ab1a55d7d12b28a3203 100644
--- a/Source/platform/scroll/ScrollTypes.h
+++ b/Source/platform/scroll/ScrollTypes.h
@@ -30,6 +30,12 @@
 
 namespace blink {
 
+enum ScrollType {
+    UserScroll,
+    ProgrammaticScroll,
+    CompositorScroll
+};
+
 enum ScrollDirection {
     ScrollUpIgnoringWritingMode,
     ScrollDownIgnoringWritingMode,
@@ -49,12 +55,6 @@ enum ScrollDirectionPhysical {
     ScrollRight
 };
 
-enum ScrollType {
-    UserScroll,
-    ProgrammaticScroll,
-    CompositorScroll
-};
-
 // Convert logical scroll direction to physical. Physical scroll directions are unaffected.
 inline ScrollDirectionPhysical toPhysicalDirection(ScrollDirection direction, bool isVertical, bool isFlipped)
 {