Fix typo in IdentityManager's method comment

Fix typo in |IdentityManager::HasPrimaryAccount| method comment

Change-Id: Id773ea65383ce6bfb6727d35ce0b65980321979f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2157050Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Andrei Salavei <solovey@google.com>
Cr-Commit-Position: refs/heads/master@{#761137}

components/signin/public/identity_manager/identity_manager.h

@@ -178,7 +178,7 @@ class IdentityManager : public KeyedService,
       ConsentLevel consent = ConsentLevel::kSync) const;
 
   // Returns whether the user's primary account is available. If consent is
-  // |ConsentLevel::kSyn| then true implies that the user has blessed this
+  // |ConsentLevel::kSync| then true implies that the user has blessed this
   // account for sync.
   bool HasPrimaryAccount(ConsentLevel consent = ConsentLevel::kSync) const;