Revert "Disabling ExtensionPrefStoreTest on valgrind bot as they have memory leak."
Revert "Disabling ExtensionPrefStoreTest on valgrind bot as they have memory leak."

This reverts commit 8bf6c8c414c2614440c11f75cb91c345eac32a46.

will be replaced with suppression

TBR=stuartmorgan@chromium.org

Review URL: http://codereview.chromium.org/2913010

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@52197 0039d316-1c4b-4281-b951-d872f2087c98

gavinp/chromium,ropik/chromium,gavinp/chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,yitian134/chromium,ropik/chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,ropik/chromium,ropik/chromium,ropik/chromium,gavinp/chromium,yitian134/chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,ropik/chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,adobe/chromium,adobe/chromium,adobe/chromium,adobe/chromium,adobe/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,adobe/chromium,Crystalnix/house-of-life-chromium,adobe/chromium,gavinp/chromium,gavinp/chromium,gavinp/chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,adobe/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,Crystalnix/house-of-life-chromium,gavinp/chromium