Update expectations for Linux x64 nacl_helper sizes:

https://chromeperf.appspot.com/report?masters=Chromium&bots=chromium-rel-linux-64&tests=sizes%2Fchrome&checked=core&start_rev=243989&end_rev=24421

BUG=333373
R=dtu@chromium.org, mek@chromium.org

Review URL: https://codereview.chromium.org/134693002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244231 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244231