SGTM if all callers are using DO_NOT_SEND_COOKIES.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/49c44f6ba26559359103400eb2480a832955d71f

commit 49c44f6ba26559359103400eb2480a832955d71f
Author: meacer <meacer@chromium.org>
Date: Fri Apr 28 22:06:08 2017

Remove unused CookiePreferences from report sender and never send cookies

All non-test callers of ReportSender use CookiePreferences::DO_NOT_SEND_COOKIES.
Remove the enum altogether.

BUG= 716098 

Review-Url: https://codereview.chromium.org/2851493003
Cr-Commit-Position: refs/heads/master@{#468150}

[modify] https://crrev.com/49c44f6ba26559359103400eb2480a832955d71f/chrome/browser/profiles/profile_io_data.cc
[modify] https://crrev.com/49c44f6ba26559359103400eb2480a832955d71f/chrome/browser/safe_browsing/certificate_reporting_service.cc
[modify] https://crrev.com/49c44f6ba26559359103400eb2480a832955d71f/chrome/browser/safe_browsing/certificate_reporting_service_unittest.cc
[modify] https://crrev.com/49c44f6ba26559359103400eb2480a832955d71f/chrome/browser/safe_browsing/mock_permission_report_sender.cc
[modify] https://crrev.com/49c44f6ba26559359103400eb2480a832955d71f/chrome/browser/safe_browsing/notification_image_reporter.cc
[modify] https://crrev.com/49c44f6ba26559359103400eb2480a832955d71f/chrome/browser/safe_browsing/permission_reporter.cc
[modify] https://crrev.com/49c44f6ba26559359103400eb2480a832955d71f/chrome/browser/ssl/chrome_expect_ct_reporter.cc
[modify] https://crrev.com/49c44f6ba26559359103400eb2480a832955d71f/chrome/browser/ssl/chrome_expect_ct_reporter_unittest.cc
[modify] https://crrev.com/49c44f6ba26559359103400eb2480a832955d71f/components/certificate_reporting/error_reporter.cc
[modify] https://crrev.com/49c44f6ba26559359103400eb2480a832955d71f/components/certificate_reporting/error_reporter.h
[modify] https://crrev.com/49c44f6ba26559359103400eb2480a832955d71f/components/certificate_reporting/error_reporter_unittest.cc
[modify] https://crrev.com/49c44f6ba26559359103400eb2480a832955d71f/ios/chrome/browser/browser_state/chrome_browser_state_io_data.cc
[modify] https://crrev.com/49c44f6ba26559359103400eb2480a832955d71f/net/url_request/report_sender.cc
[modify] https://crrev.com/49c44f6ba26559359103400eb2480a832955d71f/net/url_request/report_sender.h
[modify] https://crrev.com/49c44f6ba26559359103400eb2480a832955d71f/net/url_request/report_sender_unittest.cc