Revert "Enable SafeBrowsingIsRealtimeReportingEnabledTest on Chrome OS."

This reverts commit 1a7be35f.

Reason for revert: Deterministically fails on linux-chromeos-chrome, starting: https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome/1806

Original change's description:
> Enable SafeBrowsingIsRealtimeReportingEnabledTest on Chrome OS.
> 
> Previously no setup was done for Chrome OS and the tests assumed that
> RealtimeReporting is never enabled on Chrome OS.
> Now it covers the same scenarios as on other platforms, but requires
> some extensive setup.
> 
> In a follow-up CL I'll add Chrome OS specific tests for different
> scenarios, e.g.device/user managed/non-managed and etc.
> 
> Bug: 1012048
> Change-Id: I810ae8c541fa0040ff63a8d7377129246a5473c8
> Tests: Unit test updated.
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2002514
> Reviewed-by: Daniel Rubery <drubery@chromium.org>
> Commit-Queue: Sergey Poromov <poromov@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#732562}

TBR=poromov@chromium.org,drubery@chromium.org

Change-Id: I569a1e59f1c823d49b0b2f3c465276215ad7c49b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1012048
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2006274Reviewed-by: Meredith Lane <meredithl@chromium.org>
Commit-Queue: Meredith Lane <meredithl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732639}

chrome/browser/extensions/api/safe_browsing_private/safe_browsing_private_event_router_unittest.cc

@@ -28,17 +28,6 @@
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-#if defined(OS_CHROMEOS)
-#include "chrome/browser/chromeos/login/users/fake_chrome_user_manager.h"
-#include "chrome/browser/chromeos/profiles/profile_helper.h"
-#include "chrome/browser/chromeos/settings/scoped_cros_settings_test_helper.h"
-#include "chrome/browser/policy/profile_policy_connector.h"
-#include "chromeos/tpm/stub_install_attributes.h"
-#include "components/account_id/account_id.h"
-#include "components/user_manager/scoped_user_manager.h"
-#include "components/user_manager/user.h"
-#endif
-
 using ::testing::_;
 using ::testing::Mock;
 using ::testing::SaveArg;
@@ -828,30 +817,12 @@ class SafeBrowsingIsRealtimeReportingEnabledTest
 
     TestingBrowserProcess::GetGlobal()->local_state()->SetBoolean(
         prefs::kUnsafeEventsReportingEnabled, is_policy_enabled_);
-
-#if defined(OS_CHROMEOS)
-    auto user_manager = std::make_unique<chromeos::FakeChromeUserManager>();
-    const AccountId account_id(
-        AccountId::FromUserEmail(profile_->GetProfileUserName()));
-    const user_manager::User* user = user_manager->AddUserWithAffiliation(
-        account_id, /*is_affiliated=*/true);
-    chromeos::ProfileHelper::Get()->SetUserToProfileMappingForTesting(user,
-                                                                      profile_);
-    user_manager->UserLoggedIn(account_id, user->username_hash(),
-                               /*browser_restart=*/false,
-                               /*is_child=*/false);
-    scoped_user_manager_ = std::make_unique<user_manager::ScopedUserManager>(
-        std::move(user_manager));
-    profile_->ScopedCrosSettingsTestHelper()
-        ->InstallAttributes()
-        ->SetCloudManaged("domain.com", "device_id");
-    profile_->GetProfilePolicyConnector()->OverrideIsManagedForTesting(
-        is_manageable_);
-#endif
   }
 
   bool should_init() {
-#if BUILDFLAG(GOOGLE_CHROME_BRANDING)
+#if defined(OS_CHROMEOS)
+    return false;
+#elif BUILDFLAG(GOOGLE_CHROME_BRANDING)
     return is_feature_flag_enabled_;
 #else
     return is_feature_flag_enabled_ && is_manageable_;
@@ -864,11 +835,6 @@ class SafeBrowsingIsRealtimeReportingEnabledTest
   const bool is_manageable_;
   const bool is_policy_enabled_;
   const bool is_authorized_;
-
-#if defined(OS_CHROMEOS)
- private:
-  std::unique_ptr<user_manager::ScopedUserManager> scoped_user_manager_;
-#endif
 };
 
 TEST_P(SafeBrowsingIsRealtimeReportingEnabledTest,
@@ -887,7 +853,9 @@ TEST_P(SafeBrowsingIsRealtimeReportingEnabledTest, CheckRealtimeReport) {
       api::safe_browsing_private::OnPolicySpecifiedPasswordChanged::kEventName);
   event_router_->AddEventObserver(&event_observer);
 
-#if BUILDFLAG(GOOGLE_CHROME_BRANDING)
+#if defined(OS_CHROMEOS)
+  bool should_report = false;
+#elif BUILDFLAG(GOOGLE_CHROME_BRANDING)
   bool should_report =
       is_feature_flag_enabled_ && is_policy_enabled_ && is_authorized_;
 #else