Disable ArgumentValidation test, as it crashes on Mac.

chrome/browser/extensions/webstore_startup_installer_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 "base/command_line.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 128 matching lines @@
   RunTest("runTest2");
 }
 
 IN_PROC_BROWSER_TEST_F(WebstoreStartupInstallerTest, FindLink) {
   ui_test_utils::NavigateToURL(
       browser(), GenerateTestServerUrl(kAppDomain, "find_link.html"));
 
   RunTest("runTest");
 }
 
-IN_PROC_BROWSER_TEST_F(WebstoreStartupInstallerTest, ArgumentValidation) {
+// Crashes at random intervals on MacOS: http://crbug.com/95713.
+#if defined(OS_MACOSX)
+#define Maybe_ArgumentValidation DISABLED_ArgumentValidation
+#else
+#define Maybe_ArgumentValidation ArgumentValidation
+#endif
+IN_PROC_BROWSER_TEST_F(WebstoreStartupInstallerTest, Maybe_ArgumentValidation) {
   CommandLine::ForCurrentProcess()->AppendSwitchASCII(
       switches::kAppsGalleryInstallAutoConfirmForTests, "cancel");
 
   // Each of these tests has to run separately, since one page/tab can
   // only have one in-progress install request. These tests don't all pass
   // callbacks to install, so they have no way to wait for the installation
   // to complete before starting the next test.
   bool is_finished = false;
   for (int i = 0; !is_finished; ++i) {
     ui_test_utils::NavigateToURL(
@@ skipping 202 matching lines @@
       switches::kLimitedInstallFromWebstore, "2");
   command_line->AppendSwitchASCII(
       switches::kAppsGalleryInstallAutoConfirmForTests, "cancel");
   extensions::StartupHelper helper;
   helper.LimitedInstallFromWebstore(*command_line, browser()->profile(),
       MessageLoop::QuitWhenIdleClosure());
   MessageLoop::current()->Run();
   EXPECT_FALSE(saw_install());
   EXPECT_EQ(0, browser_open_count());
 }