Revert 118074 - Disable FPO throughout client_socket_pool_base.cc.
Revert 118074 - Disable FPO throughout client_socket_pool_base.cc.

This will help track down the origin of a use-after-free bug.

BUG=109876


Review URL: http://codereview.chromium.org/9240036

TBR=eroman@chromium.org
Review URL: https://chromiumcodereview.appspot.com/9271013

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@118510 0039d316-1c4b-4281-b951-d872f2087c98

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