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With Chrome / App Launcher unification, the App Launcher can be installed at system-level. Old DCHECK's to enforce otherwise are creating bogus failures, and should be removed. 

This bug is triggered by https://chromiumcodereview.appspot.com/14711006/ , which adds "shadow" App Launcher Clients/ClientState keys to support 7DA tracking for App Launcher. Unfortunately, these keys are read, and are interpreted as the presence of App Launcher (thus triggering DCHECK).

A separate issue is that installation_validator complains about missing information in the "shadow" registry key. This is less urgent, and hence not part of this CL.

BUG=243432

Review URL: https://chromiumcodereview.appspot.com/15915003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202605 0039d316-1c4b-4281-b951-d872f2087c98