Disable NaClBrowserTestNewlib.Bad on Mac since it's failing after open sourcing the PDF plugin.

chrome/test/nacl/nacl_browsertest.cc

 // 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.
 
 #include <stdio.h>
 #if defined(OS_POSIX)
 #include <unistd.h>
 #elif defined(OS_WIN)
 #include <windows.h>
 #endif
@@ skipping 64 matching lines @@
 NACL_BROWSER_TEST_F(NaClBrowserTest, ProgressEvents, {
   RunNaClIntegrationTest(FILE_PATH_LITERAL("ppapi_progress_events.html"));
 })
 
 // Note: currently not run on PNaCl because crash throttling causes the last few
 // tests to fail for the wrong reasons.  Enabling this test would also require
 // creating a new set of manifests because shared NaCl/PNaCl manifests are not
 // allowed.  Also not run on GLibc because it's a large test that is at risk of
 // causing timeouts.
 // crbug/338444
-#if defined(OS_WIN)
+// crbug.com/375103: fails on Mac after open sourcing PDF plugin.
+#if defined(OS_WIN) || defined(OS_MACOSX)
 #define MAYBE_Bad DISABLED_Bad
 #else
 #define MAYBE_Bad Bad
 #endif
 IN_PROC_BROWSER_TEST_F(NaClBrowserTestNewlib, MAYBE_Bad) {
   RunNaClIntegrationTest(FILE_PATH_LITERAL("ppapi_bad.html"));
 }
 
 // partially_invalid.c does not have an ARM version of its asm.
 #if !defined(__arm__)
@@ skipping 358 matching lines @@
   }
 };
 
 // TODO(ncbray) support glibc and PNaCl
 IN_PROC_BROWSER_TEST_F(NaClBrowserTestNewlibExtension, MimeHandler) {
   RunNaClIntegrationTest(FILE_PATH_LITERAL(
       "ppapi_extension_mime_handler.html"));
 }
 
 }  // namespace