Remove Vector reallocation code.
Remove Vector reallocation code.

Replace the only usage with a simpler, faster optimization.
(The optimization isn't huge, it only triggers 5 times during NTP load.)

Review URL: https://chromiumcodereview.appspot.com/23475056

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@158003 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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