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

ppapi/utility/graphics/paint_aggregator.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_UTILITY_GRAPHICS_PAINT_AGGREGATOR_H_
 #define PPAPI_UTILITY_GRAPHICS_PAINT_AGGREGATOR_H_
 
 #include <stddef.h>
 #include <vector>
 
@@ skipping 107 matching lines @@
 
  private:
   // This structure is an internal version of PaintUpdate. It's different in
   // two respects:
   //
   //  - The scroll damange (area exposed by the scroll operation, if any) is
   //    maintained separately from the dirty rects generated by calling
   //    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();
     ~InternalPaintUpdate();
 
     // Computes the rect damaged by scrolling within |scroll_rect| by
     // |scroll_delta|. This rect must be repainted. It is not included in
     // paint_rects or in the rect returned by GetPaintBounds.
     Rect GetScrollDamage() const;
 
@@ skipping 26 matching lines @@
   // important since there is typically some overhead in deciding what to
   // paint. If your plugin is fast at doing these computations, raise this
   // threshold, if your plugin is slow, lower it (probably requires some
   // tuning to find the right value).
   size_t max_paint_rects_;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_UTILITY_PAINT_AGGREGATOR_H_