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PendingExtensionManager has no reason to depend on ExtensionService.  So remove
it.

If there is a desire for PendingExtensionManager to be in /extensions, it would
be very easy to do so - the only thing keeping it in /chrome is a constant.

Review URL: https://codereview.chromium.org/297613002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271855 0039d316-1c4b-4281-b951-d872f2087c98