Disable unit_tests for memcheck/Mac by checking in chrome_tests.py

Undo attempt to disable from unit_tests.gtest_mac.txt as it didn't solve the problem.

BUG=51716
TEST=Chromium Mac (Valgrind)(1) bot

Review URL: https://chromiumcodereview.appspot.com/9316020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@120039 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/chrome_tests.py

 #!/usr/bin/env python
-# Copyright (c) 2011 The Chromium Authors. All rights reserved.
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
@@ -281,6 +281,12 @@ class ChromeTests:
     return self.SimpleTest("webkit", "test_shell_tests")
 
   def TestUnit(self):
+    # http://crbug.com/51716
+    # Disabling all unit tests
+    # Problems reappeared after r119922
+    if common.IsMac() and (self._options.valgrind_tool == "memcheck"):
+      logging.warning("unit_tests are disabled for memcheck on MacOS.")
+      return 0;
     return self.SimpleTest("chrome", "unit_tests")
 
   def TestUIUnit(self):

tools/valgrind/gtest_exclude/unit_tests.gtest_mac.txt

-# crbug 51716
-# Disabling all unit tests
-# Problems reappeared after r119922
-*
-*.*
-
 # Times out too often
 # crbug.com/15817
 IPCSyncChannelTest.*