"up-to-date" should only use hyphens when used as compound modifier of a noun

ppapi/utility/graphics/paint_aggregator.h

Index: ppapi/utility/graphics/paint_aggregator.h
diff --git a/ppapi/utility/graphics/paint_aggregator.h b/ppapi/utility/graphics/paint_aggregator.h
index 74e24da6b063425059388d1c3b70ce75b5a839e1..ba214de4d9184bb5aab6a4743b943ed46f5dd083 100644
--- a/ppapi/utility/graphics/paint_aggregator.h
+++ b/ppapi/utility/graphics/paint_aggregator.h
@@ -125,7 +125,7 @@ class PaintAggregator {
   //    InvalidateRect. We need to know this distinction for some operations.
   //
   //  - The paint bounds union is computed on the fly so we don't have to keep
-  //    a rectangle up-to-date as we do different operations.
+  //    a rectangle up to date as we do different operations.
   class InternalPaintUpdate {
    public:
     InternalPaintUpdate();