Remove a valgrind suppression which isn't being used.
Remove a valgrind suppression which isn't being used.

This hasn't shown up on the buildbots during the past 40 cycles of:

   Chromium Mac (valgrind)
   Chromium Mac UI (valgrind)(1)
   Chromium Mac UI (valgrind)(2)
   Chromium Mac UI (valgrind)(3)
   Linux Tests (valgrind)(1)
   Linux Tests (valgrind)(2)
   Linux Tests (valgrind)(3)
   Linux Tests (valgrind)(4)
   Webkit Linux (valgrind)
   Webkit_Linux_(valgrind_layout)

BUG=22559

Review URL: http://codereview.chromium.org/264017

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@28466 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