Followup to https://codereview.chromium.org/1001673002/

util/test/thread_win.cc

 // Copyright 2015 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 10 matching lines @@
 namespace test {
 
 void Thread::Start() {
   ASSERT_FALSE(platform_thread_);
   platform_thread_ =
       CreateThread(nullptr, 0, ThreadEntryThunk, this, 0, nullptr);
   ASSERT_TRUE(platform_thread_) << ErrorMessage("CreateThread");
 }
 
 void Thread::Join() {
-  ASSERT_FALSE(platform_thread_);
+  ASSERT_TRUE(platform_thread_);
   DWORD result = WaitForSingleObject(platform_thread_, INFINITE);
   EXPECT_EQ(WAIT_OBJECT_0, result) << ErrorMessage("WaitForSingleObject");
   platform_thread_ = 0;
 }
 
 // static
 DWORD WINAPI Thread::ThreadEntryThunk(void* argument) {
   Thread* self = reinterpret_cast<Thread*>(argument);
   self->ThreadMain();
   return 0;
 }
 
 }  // namespace test
 }  // namespace crashpad