Fix nit which is unefficiant sequence to deleteMarkedNodes.
Fix nit which is unefficiant sequence to deleteMarkedNodes.

deleteMarkedNodes need to move postion to prevent unefficiant do while loop.

BUG=none

Review URL: https://codereview.chromium.org/246793004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@172279 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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