Avoid some code duplication in HTMLTableRowsCollection::rowAfter()
Avoid some code duplication in HTMLTableRowsCollection::rowAfter()

Avoid some code duplication in HTMLTableRowsCollection::rowAfter() by
factoring out the code for finding a table row element among children
to a new function. This code was repeated 3 times.

R=adamk, eseidel

Review URL: https://codereview.chromium.org/166093004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@167242 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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