Remove unneeded GaiaCookieManagerService includes

There is one include in the codebase remaining other than from the
IdentityManager internals; that include is actually needed and will
take a little more work to remove.

TBR=sdefresne@chromium.org

Bug: 970268
Change-Id: I951701779d94c45380883d22f0e35187cbee1a8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1674089
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671681}

chrome/browser/chromeos/login/signin/oauth2_login_verifier.cc

@@ -7,7 +7,6 @@
 #include <vector>
 
 #include "base/logging.h"
-#include "components/signin/core/browser/gaia_cookie_manager_service.h"
 #include "content/public/browser/browser_thread.h"
 #include "services/identity/public/cpp/accounts_cookie_mutator.h"
 
@@ -50,7 +49,7 @@ void OAuth2LoginVerifier::VerifyUserCookies() {
 void OAuth2LoginVerifier::VerifyProfileTokens() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
-  GaiaCookieManagerService::AddAccountToCookieCompletedCallback
+  identity::AccountsCookieMutator::AddAccountToCookieCompletedCallback
       completion_callback =
           base::BindOnce(&OAuth2LoginVerifier::OnAddAccountToCookieCompleted,
                          weak_ptr_factory_.GetWeakPtr());

ios/chrome/browser/browser_state/chrome_browser_state_manager_impl.cc

@@ -18,7 +18,6 @@
 #include "base/threading/scoped_blocking_call.h"
 #include "components/password_manager/core/browser/password_store.h"
 #include "components/prefs/pref_service.h"
-#include "components/signin/core/browser/gaia_cookie_manager_service.h"
 #include "components/signin/ios/browser/active_state_manager.h"
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/browser/browser_state/browser_state_info_cache.h"