[Smart Lock] Remove debug CHECK.

Remove speculative debug CHECK added in crrev.com/c/1705014.

Bug: 969135
Change-Id: I18d7867d6ba82818db2eb9992687c1541886b420
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1783881
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Auto-Submit: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693376}

chrome/browser/chromeos/login/easy_unlock/easy_unlock_service.cc

@@ -192,14 +192,7 @@ EasyUnlockService::EasyUnlockService(
       shut_down_(false),
       tpm_key_checked_(false) {}
 
-EasyUnlockService::~EasyUnlockService() {
-  // TODO(crbug.com/969135): Remove this once crbug.com/969135 is resolved.
-  // This CHECK ensures that EasyUnlockService is shutdown before it's deleted.
-  // This is added because the stack trace of the crash in question implies
-  // that a deleted member variable of EasyUnlockService is being touched during
-  // EasyUnlockService::Shutdown().
-  CHECK(shut_down_);
-}
+EasyUnlockService::~EasyUnlockService() = default;
 
 // static
 void EasyUnlockService::RegisterProfilePrefs(