Remove outdated suppression for GpuProcessHostUIShim

Remove outdated suppression for GpuProcessHostUIShim

BUG=73828
TEST=Valgrind stays green
TBR=nduca@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9578007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124902 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions.txt

@@ -2999,12 +2999,6 @@
    fun:_ZN2v88internal19HandleApiCallHelperILb0EEEPNS0_11MaybeObjectENS0_47_GLOBAL__N_v8_src_builtins.cc_*BuiltinArgumentsILNS0_21BuiltinExtraArgumentsE1EEE
    obj:*
 }
-{
-   bug_73828
-   Memcheck:Leak
-   ...
-   fun:_ZN20GpuProcessHostUIShim14GetForRendererEi
-}
 {
    bug_74383a
    Memcheck:Uninitialized