ChromeOS cryptohome should be able to use gaia id as user identifier.

chrome/browser/browsing_data/browsing_data_remover.cc

Index: chrome/browser/browsing_data/browsing_data_remover.cc
diff --git a/chrome/browser/browsing_data/browsing_data_remover.cc b/chrome/browser/browsing_data/browsing_data_remover.cc
index bf9d8277fdcfeab87e322ffe6afd6115a615e0f6..af3675d02049b38ae93974f44cdb5333a762c65e 100644
--- a/chrome/browser/browsing_data/browsing_data_remover.cc
+++ b/chrome/browser/browsing_data/browsing_data_remover.cc
@@ -89,6 +89,7 @@
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chromeos/attestation/attestation_constants.h"
+#include "chromeos/cryptohome/cryptohome_parameters.h"
 #include "chromeos/dbus/cryptohome_client.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "components/user_manager/user.h"
@@ -886,7 +887,8 @@ void BrowsingDataRemover::RemoveImpl(const TimeRange& time_range,
       chromeos::DBusThreadManager::Get()
           ->GetCryptohomeClient()
           ->TpmAttestationDeleteKeys(
-              chromeos::attestation::KEY_USER, user->email(),
+              chromeos::attestation::KEY_USER,
+              cryptohome::Identification(user->GetAccountId()),
               chromeos::attestation::kContentProtectionKeyPrefix,
               base::Bind(&BrowsingDataRemover::OnClearPlatformKeys,
                          weak_ptr_factory_.GetWeakPtr()));