Disable a flaky test under MemorySanitizer.

chrome/browser/extensions/api/tab_capture/tab_capture_apitest.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/basictypes.h"
 #include "base/command_line.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_test_message_listener.h"
 #include "chrome/browser/extensions/tab_helper.h"
@@ skipping 216 matching lines @@
                                                                  false);
   fullscreen_entered.Reply("");
 
   ResultCatcher catcher;
   catcher.RestrictToProfile(browser()->profile());
   EXPECT_TRUE(catcher.GetNextResult()) << catcher.message();
 }
 
 // Times out on Win dbg bots: http://crbug.com/177163
 // #if defined(OS_WIN) && !defined(NDEBUG)
-// Times out on all Win bots: http://crbug.com/294431
-#if defined(OS_WIN)
+// Times out on all Win bots, flaky on MSan bots: http://crbug.com/294431
+#if defined(OS_WIN) || defined(MEMORY_SANITIZER)
 #define MAYBE_GrantForChromePages DISABLED_GrantForChromePages
 #else
 #define MAYBE_GrantForChromePages GrantForChromePages
 #endif
 // Make sure tabCapture API can be granted for Chrome:// pages.
 IN_PROC_BROWSER_TEST_F(TabCaptureApiTest, MAYBE_GrantForChromePages) {
   ExtensionTestMessageListener before_open_tab("ready1", true);
   ASSERT_TRUE(RunExtensionSubtest("tab_capture",
                                   "active_tab_chrome_pages.html"))
       << message_;
@@ skipping 38 matching lines @@
 #endif
 IN_PROC_BROWSER_TEST_F(TabCaptureApiTest, MAYBE_Constraints) {
   AddExtensionToCommandLineWhitelist();
   ASSERT_TRUE(RunExtensionSubtest("tab_capture", "constraints.html"))
       << message_;
 }
 
 }  // namespace
 
 }  // namespace extensions