Remove unnecessary account_consistency_method.h includes in //ios

Some files of //ios have been including account_consistency_method.h
even though they don't use AccountConsistencyMethod or DiceMethodGreaterOrEqual().

This CL removes all unnecessary account_consistency_method.h includes.
Instead, this CL adds the include to the files where AccountConsistencyMethod
is used actually.

Bug: 970268
Change-Id: I7a7e18614523bd8783b73d09abb0ce0898f9ce9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1699564
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676853}

ios/chrome/browser/ui/authentication/chrome_signin_view_controller.mm

@@ -18,7 +18,6 @@
 #import "base/strings/sys_string_conversions.h"
 #include "base/timer/elapsed_timer.h"
 #include "components/consent_auditor/consent_auditor.h"
-#include "components/signin/public/base/account_consistency_method.h"
 #include "components/signin/public/base/signin_metrics.h"
 #include "components/strings/grit/components_strings.h"
 #include "components/unified_consent/feature.h"

ios/chrome/browser/ui/authentication/chrome_signin_view_controller_unittest.mm

@@ -13,7 +13,6 @@
 #include "base/timer/mock_timer.h"
 #include "components/consent_auditor/consent_auditor.h"
 #include "components/consent_auditor/fake_consent_auditor.h"
-#include "components/signin/public/base/account_consistency_method.h"
 #include "components/signin/public/identity_manager/identity_manager.h"
 #include "components/unified_consent/feature.h"
 #include "components/unified_consent/scoped_unified_consent.h"

ios/chrome/browser/ui/signin_interaction/signin_interaction_controller.mm

@@ -8,7 +8,6 @@
 #include "base/logging.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/prefs/pref_service.h"
-#include "components/signin/public/base/account_consistency_method.h"
 #include "components/signin/public/base/signin_pref_names.h"
 #include "components/signin/public/identity_manager/identity_manager.h"
 #include "components/unified_consent/feature.h"

ios/web_view/internal/sync/cwv_sync_controller_unittest.mm

@@ -12,6 +12,7 @@
 #include "base/files/file_path.h"
 #include "base/test/bind_test_util.h"
 #include "components/signin/core/browser/signin_error_controller.h"
+#include "components/signin/public/base/account_consistency_method.h"
 #include "components/signin/public/identity_manager/identity_test_utils.h"
 #include "components/sync/driver/mock_sync_service.h"
 #include "components/sync/driver/sync_service_observer.h"