Enable EndToEndTest.LargePostNoPacketLoss on linux valgrind bot

R=timurrrr@chromium.org
TBR=thestig@chromium.org
BUG=297040
NOTRY=true

Review URL: https://codereview.chromium.org/26675005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227957 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227957