Some minor touchups to the new DOM grouping code.   - Explicitly use std::sort not sort, got lucky before?   - Filter out orphan DOM nodes earlier, this shouldn't make a difference.   - Fix some comments to be more accurate and a few bits of style.
Some minor touchups to the new DOM grouping code.
  - Explicitly use std::sort not sort, got lucky before?
  - Filter out orphan DOM nodes earlier, this shouldn't make a difference.
  - Fix some comments to be more accurate and a few bits of style.

Review URL: http://codereview.chromium.org/13742

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@6783 0039d316-1c4b-4281-b951-d872f2087c98

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