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The comment suggests that one can manage the factory instance using the Singleton class.
That is not possible as Singleton<T> has private methods only and declares only T::GetInstance as friend.
BrowserContextKeyedAPIFactory<X>::GetInstance cannot be defined by users however.

That misleading comment was added here
https://chromiumcodereview.appspot.com/11682005

Review URL: https://codereview.chromium.org/1135343003

Cr-Commit-Position: refs/heads/master@{#330068}