Exclude SamplingProfileTest.Sample from win valgrind bots.

This test makes assumptions that the native code will run, which is at odds with how valgrind works.

BUG=None
TBR=siggi@chromium.org

Review URL: http://codereview.chromium.org/8882001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113517 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/gtest_exclude/base_unittests.gtest_win32.txt

@@ -5,3 +5,8 @@ TimeTicks.WinRollover
 TimeTicks.Deltas
 TimeTicks.HighResNow
 TimerTest.RepeatingTimer*
+
+# This Windows-native sampling profiler test does not
+# work under valgrind because it assumes the original
+# code runs, not the modified version under valgrind.
+SamplingProfileTest.Sample