This CL replaces e-mail with AccountId in easy signin code.

chrome/browser/chromeos/login/easy_unlock/easy_unlock_challenge_wrapper_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/login/easy_unlock/easy_unlock_challenge_wrapper.h"
 
 #include "base/bind.h"
 #include "components/proximity_auth/cryptauth/proto/securemessage.pb.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 11 matching lines @@
 
 void SaveResult(std::string* result_out, const std::string& result) {
   *result_out = result;
 }
 
 class TestableEasyUnlockChallengeWrapper : public EasyUnlockChallengeWrapper {
  public:
   TestableEasyUnlockChallengeWrapper()
       : EasyUnlockChallengeWrapper(kChallenge,
                                    kChannelBindingData,
-                                   kUserId,
+                                   AccountId::FromUserEmail(kUserId),
                                    nullptr) {}
   ~TestableEasyUnlockChallengeWrapper() override {}
 
  private:
   void SignUsingTpmKey(
       const std::string& data_to_sign,
       const base::Callback<void(const std::string&)>& callback) override {
     std::string expected_salt = std::string(kSalt);
     std::string expected_channel_binding_data =
         std::string(kChannelBindingData);
@@ skipping 27 matching lines @@
   ASSERT_TRUE(challenge_secure_message.ParseFromString(wrapped_challenge));
   EXPECT_EQ(kChallenge, challenge_secure_message.header_and_body());
 
   securemessage::SecureMessage signature_secure_message;
   ASSERT_TRUE(signature_secure_message.ParseFromString(
       challenge_secure_message.signature()));
   EXPECT_EQ(kSignature, signature_secure_message.signature());
 }
 
 }  // namespace chromeos