Revert of Add joinable option to SimpleThread::Options as was just done for Thread.

base/threading/simple_thread_unittest.cc

Index: base/threading/simple_thread_unittest.cc
diff --git a/base/threading/simple_thread_unittest.cc b/base/threading/simple_thread_unittest.cc
index 6c64a04f2e8bbb2e4a036e7bdd2e871fe782f9b2..14dd4591f1819d8e505911cd9f4cb9fb09cd54f2 100644
--- a/base/threading/simple_thread_unittest.cc
+++ b/base/threading/simple_thread_unittest.cc
@@ -2,28 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include <memory>
-
 #include "base/atomic_sequence_num.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/synchronization/waitable_event.h"
-#include "base/test/gtest_util.h"
-#include "base/threading/platform_thread.h"
 #include "base/threading/simple_thread.h"
-#include "base/time/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 namespace {
-
-// Sleeps a tiny amount to augment chances of tests using it running in races
-// should there be any while the tested thread is alive.
-class SleepRunner : public DelegateSimpleThread::Delegate {
-  void Run() override {
-    PlatformThread::Sleep(TimeDelta::FromMilliseconds(20));
-  }
-};
 
 class SetIntRunner : public DelegateSimpleThread::Delegate {
  public:
@@ -146,25 +133,6 @@
             std::string("event_waiter/") + IntToString(thread.tid()));
 }
 
-TEST(SimpleThreadTest, JoinNonJoinableThreadDeath) {
-  SleepRunner runner;
-  SimpleThread::Options options;
-  options.joinable = false;
-  DelegateSimpleThread thread(&runner, "noop_runner", options);
-
-  thread.Start();
-  EXPECT_DCHECK_DEATH(thread.Join(), "");
-}
-
-TEST(SimpleThreadTest, DeleteNonJoinableWithoutJoinIsSafe) {
-  SleepRunner runner;
-  SimpleThread::Options options;
-  options.joinable = false;
-  DelegateSimpleThread thread(&runner, "noop_runner", options);
-  thread.Start();
-  // Nothing blows up when |thread| goes out of scope.
-}
-
 TEST(SimpleThreadTest, ThreadPool) {
   AtomicSequenceNumber seq;
   SeqRunner runner(&seq);