Disabling ExtensionPrefStoreTest on valgrind bot as they have memory leak.  Please revert this once you fix this problem.
Disabling ExtensionPrefStoreTest on valgrind bot as they have memory leak.
 Please revert this once you fix this problem.

TBR=pam@chromium.org
BUG=48980
TEST=none

Review URL: http://codereview.chromium.org/2985005

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@52192 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser