Eliminate stale includes from sms_service_factory.cc

Neither signin_manager.h nor profile_oauth2_token_service.h are being
used from this implementation file, we can clean these includes up.

Bug: 890236
Change-Id: I3d6e55bc63e5c6e43115de1e46022fdee404d83e
Reviewed-on: https://chromium-review.googlesource.com/1251623Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Cr-Commit-Position: refs/heads/master@{#595092}

chrome/browser/ui/desktop_ios_promotion/sms_service_factory.cc

@@ -7,8 +7,6 @@
 #include "chrome/browser/signin/identity_manager_factory.h"
 #include "chrome/browser/ui/desktop_ios_promotion/sms_service.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
-#include "components/signin/core/browser/profile_oauth2_token_service.h"
-#include "components/signin/core/browser/signin_manager.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/storage_partition.h"
 #include "services/network/public/cpp/shared_url_loader_factory.h"