Don't run PredictorTest.MassiveConcurrentLookupTest under Valgrind on all platforms

Also remove obsolete DnsMasterTest.MassiveConcurrentLookupTest exclude filter
BUG=52844
TBR=glider
Review URL: http://codereview.chromium.org/3204006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@57317 0039d316-1c4b-4281-b951-d872f2087c98

chrome/test/data/valgrind/unit_tests.gtest.txt

@@ -4,7 +4,7 @@ VisitedLinkEventsTest.Coalescense
 VisitedLinkRelayTest.Basics
 # Hangs (or takes forever?) reliably on bots; see http://crbug.com/23580
 RenderViewTest.ImeComposition
-# Hangs sometimes; see http://crbug.com/24416
-DnsMasterTest.MassiveConcurrentLookupTest
+# Hangs sometimes; see http://crbug.com/52844
+PredictorTest.MassiveConcurrentLookupTest
 # Pure virtual method called: see http://crbug.com/50950
 ConnectionTesterTest.RunAllTests

chrome/test/data/valgrind/unit_tests.gtest_mac.txt

@@ -34,5 +34,3 @@ RenderViewTest.OnPrintPages
 RenderViewTest.Print*
 # See http://crbug.com/30397.
 TabStripControllerTest.AddRemoveTabs
-# See http://crbug.com/52844
-PredictorTest.MassiveConcurrentLookupTest