Rename UserInfo method GetEmail to GetDisplayEmail.

components/user_manager/user_names.cc

Index: components/user_manager/user_names.cc
diff --git a/components/user_manager/user_names.cc b/components/user_manager/user_names.cc
index a7cd67b16ffc565d2db87e5cb77006a6a8834576..b873a3da5d9a7983a2931fabaaf6f998b36d61c7 100644
--- a/components/user_manager/user_names.cc
+++ b/components/user_manager/user_names.cc
@@ -54,12 +54,12 @@ FixedAccountManager::FixedAccountManager()
 
 namespace user_manager {
 
-constexpr const char kStubUser[] = "stub-user@example.com";
+const char kStubUser[] = "stub-user@example.com";
 
 // Should match cros constant in platform/libchromeos/chromeos/cryptohome.h
-constexpr const char kGuestUserName[] = "$guest";
+const char kGuestUserName[] = "$guest";
 
-constexpr const char kSupervisedUserDomain[] = "locally-managed.localhost";
+const char kSupervisedUserDomain[] = "locally-managed.localhost";
 
 std::string CanonicalizeUserID(const std::string& user_id) {
   if (user_id == kGuestUserName)
@@ -67,6 +67,7 @@ std::string CanonicalizeUserID(const std::string& user_id) {
   return gaia::CanonicalizeEmail(user_id);
 }
 
+// Note: StubAccountId is used for all tests, not only ChromeOS tests.
 const AccountId& StubAccountId() {
   return FixedAccountManager::GetInstance()->stub_account_id();
 }