Remove unused includes in signin_manager_android.cc

Discovered while analyzing this code.

Change-Id: I7853c0072eca68124d60ee365e70702d0078bed2
Reviewed-on: https://chromium-review.googlesource.com/c/1488889
Commit-Queue: David Roger <droger@chromium.org>
Auto-Submit: Colin Blundell <blundell@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635542}

chrome/browser/android/signin/signin_manager_android.cc

@@ -17,7 +17,6 @@
 #include "base/memory/ref_counted.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
-#include "chrome/browser/bookmarks/bookmark_model_factory.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browsing_data/browsing_data_helper.h"
 #include "chrome/browser/browsing_data/chrome_browsing_data_remover_delegate.h"
@@ -26,17 +25,14 @@
 #include "chrome/browser/policy/cloud/user_policy_signin_service_mobile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/signin/identity_manager_factory.h"
-#include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/common/pref_names.h"
-#include "components/bookmarks/browser/bookmark_model.h"
 #include "components/google/core/common/google_util.h"
 #include "components/policy/core/browser/browser_policy_connector.h"
 #include "components/policy/core/common/cloud/cloud_policy_core.h"
 #include "components/policy/core/common/cloud/cloud_policy_store.h"
 #include "components/policy/core/common/cloud/user_cloud_policy_manager.h"
 #include "components/prefs/pref_service.h"
-#include "components/signin/core/browser/oauth2_token_service_delegate_android.h"
 #include "components/signin/core/browser/signin_pref_names.h"
 #include "content/public/browser/browsing_data_filter_builder.h"
 #include "content/public/browser/browsing_data_remover.h"
@@ -47,7 +43,6 @@
 #include "services/identity/public/cpp/primary_account_mutator.h"
 
 using base::android::JavaParamRef;
-using bookmarks::BookmarkModel;
 
 namespace {