Update from https://crrev.com/333737

base/message_loop/message_pump_libevent_unittest.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/message_loop/message_pump_libevent.h"
 
 #include <unistd.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 59 matching lines @@
 
   // base:MessagePumpLibevent::Watcher interface
   void OnFileCanReadWithoutBlocking(int fd) override {}
   void OnFileCanWriteWithoutBlocking(int fd) override {}
 };
 
 #if GTEST_HAS_DEATH_TEST && !defined(NDEBUG)
 
 // Test to make sure that we catch calling WatchFileDescriptor off of the
 // wrong thread.
-TEST_F(MessagePumpLibeventTest, TestWatchingFromBadThread) {
+#if defined(OS_CHROMEOS)
+// Flaky on Chrome OS: crbug.com/138845.
+#define MAYBE_TestWatchingFromBadThread DISABLED_TestWatchingFromBadThread
+#else
+#define MAYBE_TestWatchingFromBadThread TestWatchingFromBadThread
+#endif
+TEST_F(MessagePumpLibeventTest, MAYBE_TestWatchingFromBadThread) {
   MessagePumpLibevent::FileDescriptorWatcher watcher;
   StupidWatcher delegate;
 
   ASSERT_DEATH(io_loop()->WatchFileDescriptor(
       STDOUT_FILENO, false, MessageLoopForIO::WATCH_READ, &watcher, &delegate),
       "Check failed: "
       "watch_file_descriptor_caller_checker_.CalledOnValidThread\\(\\)");
 }
 
 TEST_F(MessagePumpLibeventTest, QuitOutsideOfRun) {
@@ skipping 166 matching lines @@
   // Queue |event| to signal on |loop|.
   loop.PostTask(FROM_HERE, Bind(&WaitableEvent::Signal, Unretained(&event)));
 
   // Now run the MessageLoop.
   run_loop.Run();
 }
 
 }  // namespace
 
 }  // namespace base