cros: Enable WebUILoginView reuse.

components/proximity_auth/screenlock_bridge.cc

Index: components/proximity_auth/screenlock_bridge.cc
diff --git a/components/proximity_auth/screenlock_bridge.cc b/components/proximity_auth/screenlock_bridge.cc
index d3996b17b05b600282c4d390c98dabf7ea3cd4ba..0663dda5403d95d930094b26cc68b3107d51014a 100644
--- a/components/proximity_auth/screenlock_bridge.cc
+++ b/components/proximity_auth/screenlock_bridge.cc
@@ -117,13 +117,13 @@ ScreenlockBridge* ScreenlockBridge::Get() {
 }
 
 void ScreenlockBridge::SetLockHandler(LockHandler* lock_handler) {
-  DCHECK(lock_handler_ == nullptr || lock_handler == nullptr);
-
   // Don't notify observers if there is no change -- i.e. if the screen was
   // already unlocked, and is remaining unlocked.
   if (lock_handler == lock_handler_)
     return;
 
+  DCHECK(lock_handler_ == nullptr || lock_handler == nullptr);
+
   // TODO(isherman): If |lock_handler| is null, then |lock_handler_| might have
   // been freed. Cache the screen type rather than querying it below.
   LockHandler::ScreenType screen_type;