Fix a typo in the excluded test name

Also, improve the comment and add a link to the bug
BUG=106829
TBR=cbentzel
Review URL: http://codereview.chromium.org/8889006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113587 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/gtest_exclude/base_unittests.gtest_win32.txt

@@ -6,7 +6,7 @@ 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
+# This Windows-native sampling profiler test does not work under our tools
+# because it assumes the original code runs, not the modified version
+# with instrumentation. See http://crbug.com/106829
+SamplingProfilerTest.Sample