[sheriff] Disable LoginUserTest.UserPassed test as flaky

https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome
https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome/3306

TBR=rsorokin@chromium.org

Bug: 1052603
Change-Id: I7a6c3542fac98c27814f016a3b65ddefac3d42bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063171Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742570}

chrome/browser/chromeos/login/login_browsertest.cc

@@ -123,7 +123,8 @@ void TestSystemTrayIsVisible(bool otr) {
 // After a chrome crash, the session manager will restart chrome with
 // the -login-user flag indicating that the user is already logged in.
 // This profile should NOT be an OTR profile.
-IN_PROC_BROWSER_TEST_F(LoginUserTest, UserPassed) {
+// Test is flaky: https://crbug.com/1052603
+IN_PROC_BROWSER_TEST_F(LoginUserTest, DISABLED_UserPassed) {
   Profile* profile = browser()->profile();
   std::string profile_base_path("hash");
   profile_base_path.insert(0, chrome::kProfileDirPrefix);