Force release the worker ref count to release the process in BrowserContext::NotifyWillBeDestroyed()

chrome/browser/chromeos/login/quick_unlock/pin_storage_unittest.cc

Index: chrome/browser/chromeos/login/quick_unlock/pin_storage_unittest.cc
diff --git a/chrome/browser/chromeos/login/quick_unlock/pin_storage_unittest.cc b/chrome/browser/chromeos/login/quick_unlock/pin_storage_unittest.cc
index 62218bf5338322fb629ce6bbdd5eee826e44ee38..de8cabd5cd1c174576ebf6b05ac61000837502e1 100644
--- a/chrome/browser/chromeos/login/quick_unlock/pin_storage_unittest.cc
+++ b/chrome/browser/chromeos/login/quick_unlock/pin_storage_unittest.cc
@@ -8,6 +8,7 @@
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/prefs/pref_service.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
@@ -21,6 +22,7 @@ class PinStorageUnitTest : public testing::Test {
   void SetUp() override { chromeos::EnableQuickUnlockForTesting(); }
 
   std::unique_ptr<TestingProfile> profile_;
+  content::TestBrowserThreadBundle thread_bundle_;

[alokp, 2016/08/16 13:19:47]

does thread_bundle_ need to outlive profile_?

[horo, 2016/08/16 13:39:10]

yes.
Without thread_bundle_, "DCHECK(current);" in ThreadTaskRunnerHandle::Get()
fails.

[21296:21296:0816/223402:1940575818456:FATAL:thread_task_runner_handle.cc(26)]
Check failed: current. 
#0 0x7effcc8a7e7e base::debug::StackTrace::StackTrace()
#1 0x7effcc90298c logging::LogMessage::~LogMessage()
#2 0x7effcca543d7 base::ThreadTaskRunnerHandle::Get()
#3 0x7effcca3d2f8 base::SequencedWorkerPool::SequencedWorkerPool()
#4 0x7effc77ea530 content::(anonymous
namespace)::BrowserThreadGlobals::BrowserThreadGlobals()
#5 0x7effc77ea4aa base::DefaultLazyInstanceTraits<>::New()
#6 0x7effc77ea3b5 base::internal::LeakyLazyInstanceTraits<>::New()
#7 0x7effc77ea36d base::LazyInstance<>::Pointer()
#8 0x7effc77e8275 base::LazyInstance<>::Get()
#9 0x7effc77e993d content::BrowserThread::CurrentlyOn()
#10 0x7effc77bc884 content::BrowserContext::NotifyWillBeDestroyed()
#11 0x000004bda9c4 Profile::MaybeSendDestroyedNotification()
#12 0x00000423ed13 TestingProfile::~TestingProfile()
#13 0x00000423f039 TestingProfile::~TestingProfile()

 
   DISALLOW_COPY_AND_ASSIGN(PinStorageUnitTest);
 };