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Refactor the CookieManager to allow it to be used without starting
Chromium. If Chromium has not been started when the cookie manager is
first used, a temporary cookie monster will be created and used to
service requests (with its own client/backend threads). If the app
subsequently triggers regular Chromium startup (e.g. by creating a
WebView) then the temporary one will be shut down cleanly before the
real instance is created.

Bug: 10969703
Change-Id: I903630cbdbccc61958e5e8b9179c0a3d09594a8b