Merge 186990

Merge 186990
> Delay loading the SigninManagerFactory until the first-run Import process has completed.
> 
> SigninManagerFactory depends on services that initialize databases
> accessed by the import process. This change ignores profile added
> notifications that occur while the import process is still running,
> instead waiting for the import finished notification to complete signin
> initialization.
> 
> BUG=180459
> 
> Review URL: https://chromiumcodereview.appspot.com/12461010

TBR=tapted@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=187381

[tapted, 2013-03-11 21:53:31]

Committed patchset #1 manually as r187381.