[signin] Add DICe flow for account consistency requests.

components/signin/ios/browser/account_consistency_service.mm

Index: components/signin/ios/browser/account_consistency_service.mm
diff --git a/components/signin/ios/browser/account_consistency_service.mm b/components/signin/ios/browser/account_consistency_service.mm
index 5f15df39e15e2604550f824dfd693f65c3ab9d2e..8cd3761935331fd98a4308e90b3f30333630b53e 100644
--- a/components/signin/ios/browser/account_consistency_service.mm
+++ b/components/signin/ios/browser/account_consistency_service.mm
@@ -15,6 +15,7 @@
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/prefs/scoped_user_pref_update.h"
 #include "components/signin/core/browser/account_reconcilor.h"
+#include "components/signin/core/browser/chrome_connected_header_helper.h"
 #include "components/signin/core/browser/signin_client.h"
 #include "components/signin/core/browser/signin_header_helper.h"
 #include "ios/web/public/browser_state.h"
@@ -331,9 +332,10 @@ void AccountConsistencyService::ApplyCookieRequests() {
   double expiration_date = 0;
   switch (cookie_requests_.front().request_type) {
     case ADD_CHROME_CONNECTED_COOKIE:
-      cookie_value = signin::BuildMirrorRequestCookieIfPossible(
-          url, signin_manager_->GetAuthenticatedAccountInfo().gaia,
-          cookie_settings_.get(), signin::PROFILE_MODE_DEFAULT);
+      cookie_value =

[msarda, 2017/06/08 23:43:05]

Let's avoid this change as explained previously.

+          signin::ChromeConnectedHeaderHelper::BuildRequestCookieIfPossible(
+              url, signin_manager_->GetAuthenticatedAccountInfo().gaia,
+              cookie_settings_.get(), signin::PROFILE_MODE_DEFAULT);
       if (cookie_value.empty()) {
         // Don't add the cookie. Tentatively correct |last_cookie_update_map_|.
         last_cookie_update_map_.erase(cookie_requests_.front().domain);