Revert of Changes look for scrollbars on windows

ui/native_theme/native_theme.h

Index: ui/native_theme/native_theme.h
diff --git a/ui/native_theme/native_theme.h b/ui/native_theme/native_theme.h
index bc71120e22612374e5831e84325a91d2aeb346bf..98974145570f35ee7cb957d6562bba965a1a6f70 100644
--- a/ui/native_theme/native_theme.h
+++ b/ui/native_theme/native_theme.h
@@ -78,12 +78,11 @@
 
   // The state of the part.
   enum State {
-    // IDs defined as specific values for use in arrays.
-    kDisabled = 0,
-    kHovered  = 1,
-    kNormal   = 2,
-    kPressed  = 3,
-    kMaxState = 4,
+    kDisabled,
+    kHovered,
+    kNormal,
+    kPressed,
+    kMaxState,
   };
 
   // Each structure below holds extra information needed when painting a given