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

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.
 
 ''' Runs various chrome tests through valgrind_test.py.'''
 
 import glob
 import logging
 import optparse
 import os
 import stat
@@ skipping 261 matching lines @@
   def TestSql(self):
     return self.SimpleTest("chrome", "sql_unittests")
 
   def TestSync(self):
     return self.SimpleTest("chrome", "sync_unit_tests")
 
   def TestTestShell(self):
     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):
     return self.SimpleTest("chrome", "ui_unittests")
 
   def TestViews(self):
     return self.SimpleTest("views", "views_unittests")
 
   # Valgrind timeouts are in seconds.
   UI_VALGRIND_ARGS = ["--timeout=14400", "--trace_children", "--indirect"]
@@ skipping 225 matching lines @@
 
   for t in options.test:
     tests = ChromeTests(options, args, t)
     ret = tests.Run()
     if ret: return ret
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(_main())