[Sync] Don't let ASP auth info blow away cached passphrase.
[Sync] Don't let ASP auth info blow away cached passphrase.

R=atwilson@chromium.org
BUG=95614
TEST=sign into sync on a new client with a two-factor account


Review URL: http://codereview.chromium.org/7859015

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@100344 0039d316-1c4b-4281-b951-d872f2087c98

ropik/chromium,yitian134/chromium,ropik/chromium,ropik/chromium,ropik/chromium,adobe/chromium,adobe/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,gavinp/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,yitian134/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium