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ExtensionRegistry observers will be notified when an extension install
is fully complete, i.e. after the extension has been loaded or added
to one of the registry extension sets.

This allows the WebstoreInstaller completion to be delayed until the
extension has been loaded. Workarounds in EphemeralAppLauncher for
launching an app can now be cleaned up since we are now assured that
the app has been loaded.

BUG=None
TEST=browser_tests

Review URL: https://codereview.chromium.org/326213004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276666 0039d316-1c4b-4281-b951-d872f2087c98