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This CL creates the signin layered component. It additionally componentizes
TokenWebData and moves it into the signin component. The refactorings performed
on TokenWebData are identical to ones performed on AutofillWebDataService:
- threads are injected rather than being obtained from content::BrowserThread
- //chrome code gets the TokenWebData for a Profile via WebDataServiceFactory
  instead of TokenWebData::FromBrowserContext.

BUG=332107
TBR=thakis

Review URL: https://codereview.chromium.org/109783003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243564 0039d316-1c4b-4281-b951-d872f2087c98