[cros] Use system request context for OAuth1 access token verification

[cros] Use system request context for OAuth1 access token verification.
Also retry if OAuth fetcher is cancelled during verification.

BUG=122972
TEST=Manual. Sign with SPDY proxy enabled. Sign out. Notice that OAuth token is valid i.e. you're not asked for OTP.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=132222

[Nikita (slow), 2012-04-12 17:58:39]

Tested, please take a look.

We might want to merge it into M19.

GoogleServiceAuthError::REQUEST_CANCELED was not necessary in context of SPDY
proxy case but feels like the state that should be treated as other network
errors.

[Ivan Korotkov, 2012-04-13 12:42:21]

lgtm

[Nikita (slow), 2012-04-13 12:45:55]

http://codereview.chromium.org/10008079/diff/2001/chrome/browser/chromeos/log...
File chrome/browser/chromeos/login/login_utils.cc (left):

http://codereview.chromium.org/10008079/diff/2001/chrome/browser/chromeos/log...
chrome/browser/chromeos/login/login_utils.cc:205:
user_profile->GetOffTheRecordProfile()->GetRequestContext(),
Zel, what was the reason why we initially were using
GetOffTheRecordProfile()->GetRequestContext() in here?

I think that using system request context is fine here.

[zel, 2012-04-13 17:08:33]

lgtm

[commit-bot: I haz the power, 2012-04-13 17:11:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/nkostylev@chromium.org/10008079/2001

[commit-bot: I haz the power, 2012-04-13 18:39:12]

Change committed as 132222