[Signin] Live signin test for cancel sync

This CL adds a new LiveSignInTest::CancelSync to the suite of live
signin tests.

The test does the following:
- Starts the signin flow from the settings page
- Enters test account credentials on the login page
- Cancels the sync confirmation dialog
- Checks that Sync is disabled and there are no accounts in Chrome and
on the web

Bug: 1008888
Change-Id: I2480fc7eed0b927048b11894e75e859abb31c917
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946371
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Commit-Queue: David Roger <droger@chromium.org>
Auto-Submit: Alex Ilin <alexilin@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720464}

chrome/browser/signin/e2e_tests/live_sign_in_test.cc

@@ -338,5 +338,33 @@ IN_PROC_BROWSER_TEST_F(LiveSignInTest, CancelSyncWithWebAccount) {
   EXPECT_FALSE(identity_manager()->HasPrimaryAccount());
 }
 
+// Starts the sign in flow from the settings page, enters credentials on the
+// login page but cancels the Sync confirmation dialog. Checks that Sync is
+// disabled and no account was added to Chrome.
+IN_PROC_BROWSER_TEST_F(LiveSignInTest, CancelSync) {
+  TestAccount test_account;
+  CHECK(GetTestAccountsUtil()->GetAccount("TEST_ACCOUNT_1", test_account));
+  SignInFromSettings(test_account);
+
+  TestIdentityManagerObserver observer(identity_manager());
+  base::RunLoop cookie_update_loop;
+  observer.SetOnAccountsInCookieUpdatedCallback(
+      cookie_update_loop.QuitClosure());
+  SignOutTestObserver sign_out_observer(identity_manager());
+
+  login_ui_test_utils::CancelSyncConfirmationDialog(
+      browser(), base::TimeDelta::FromSeconds(3));
+
+  cookie_update_loop.Run();
+  sign_out_observer.WaitForRefreshTokenRemovedForAccounts(1);
+
+  const AccountsInCookieJarInfo& accounts_in_cookie_jar =
+      identity_manager()->GetAccountsInCookieJar();
+  EXPECT_TRUE(accounts_in_cookie_jar.accounts_are_fresh);
+  EXPECT_TRUE(accounts_in_cookie_jar.signed_in_accounts.empty());
+  EXPECT_TRUE(identity_manager()->GetAccountsWithRefreshTokens().empty());
+  EXPECT_FALSE(identity_manager()->HasPrimaryAccount());
+}
+
 }  // namespace test
 }  // namespace signin