Add method Vector::shrinkToReasonableCapacity()
Add method Vector::shrinkToReasonableCapacity()

Shrinks vector capacity to the vector size if capacity is excessivly big.

BUG=

Review URL: https://codereview.chromium.org/239603005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@173420 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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