Simplify handling of BiDi cursor movement

ui/base/range/range.h

Index: ui/base/range/range.h
diff --git a/ui/base/range/range.h b/ui/base/range/range.h
index cc30dcff48ad183a207c9a71376f5ad9724fca5d..99ad004d8fb7992ab8383f3bf819c9d1ceedb5cc 100644
--- a/ui/base/range/range.h
+++ b/ui/base/range/range.h
@@ -87,7 +87,8 @@ class UI_EXPORT Range {
   bool Contains(const Range& range) const;
 
   // Computes the intersection of this range with the given |range|.
-  // If they don't intersects, it returns an InvalidRange().
+  // If they don't intersect, it returns an InvalidRange().
+  // The returned range is always empty or forward (never reversed).
   Range Intersect(const Range& range) const;
 
 #if defined(OS_MACOSX)