Bug 906116 - part2: Fix comment for nsChangeHint_ReconstructFrame. r=dbaron

The comment for nsChangeHint_ReconstructFrame is out-of-date.

In RestyleManager::ProcessRestyledFrames, we actually ignore all of the other
hints if ReconstructFrame is set. The old version was written when
ReconstructFrame was listed last. So, update the comment.

MozReview-Commit-ID: 97wMrW6S6ID

--HG--
extra : rebase_source : f1556012073e088af96c2e389532f1ae04b165af

layout/base/nsChangeHint.h

@@ -70,8 +70,11 @@ enum nsChangeHint {
 
   /**
    * Change requires frame change (e.g., display:).
-   * This subsumes all the above. Reconstructs all frame descendants,
-   * including following placeholders to out-of-flows.
+   * Reconstructs all frame descendants, including following placeholders
+   * to out-of-flows.
+   *
+   * Note that this subsumes all the other change hints. (see
+   * RestyleManager::ProcessRestyledFrames for details).
    */
   nsChangeHint_ReconstructFrame = 1 << 10,