Reland: Adjust ChromeToMobile error logging and mitigation.

Reland: Adjust ChromeToMobile error logging and mitigation.
A continuation of http://codereview.chromium.org/10913089

The original http://crrev.com/155317 exacerbated http://crbug.com/146826
Thus, it was reverted in http://crrev.com/155364

This CL additionally manages URLFetcher lifetimes with a ScopedVector.

Original CL Description follows:
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Adjust ChromeToMobile error logging and mitigation.

Increase kMaxRetries for URLFetcher to 5 (common elsewhere).
Decrease kDelayHours for URLFetcher to 1hr (w/exp backoff).

Clear |access_token_| with new kGaiaOAuth2LoginAccessToken.
Clear |access_token_| *and devices* on OnGetTokenFailure().
Handle invalid login refresh tokens as OnGetTokenFailure().
Clear token, devices, retry on 403 (auth) search responses.

Add and log some new BAD_* UMA Metric enum values.
(407 related to Issue 146685 and perhaps Issue 137267)
LOG (Chrome, not UMA) send response data on failure.

Corresponding src/tools/histograms/histograms.xml change:
https://chromereviews.googleplex.com/4782033

BUG=102709, 120941, 146685, 146826
TEST=Less Chrome To Mobile failures, additional insightful logging.

[msw, 2012-09-07 15:19:20]

Scott, Tommy, Raghu, please take a look; thanks!

[msw, 2012-09-07 15:51:04]

I split the leak fix out to: http://codereview.chromium.org/10914147/
If that sticks, perhaps I'll be able to revert the revert and ditch this CL.

[sky, 2012-09-07 16:19:58]

LGTM

[Raghu Simha, 2012-09-07 17:15:55]

URLFetcher stuff LGTM.

http://codereview.chromium.org/10918119/diff/2001/chrome/browser/chrome_to_mo...
File chrome/browser/chrome_to_mobile_service.h (right):

http://codereview.chromium.org/10918119/diff/2001/chrome/browser/chrome_to_mo...
chrome/browser/chrome_to_mobile_service.h:17: #include
"base/memory/scoped_vector.h"
nit: This goes above weak_ptr.h.

[msw, 2012-09-07 19:34:15]

Closing (abandoning this CL), sorry for confusion/churn.
The leak fix landed as http://crrev.com/155417
The original CL was re-landed as http://crrev.com/155449
(I was able to revert the revert of the original CL)