ChromeOS: implement per-user time zone preferences.

chrome/browser/browsing_data/chrome_browsing_data_remover_delegate_unittest.cc

Index: chrome/browser/browsing_data/chrome_browsing_data_remover_delegate_unittest.cc
diff --git a/chrome/browser/browsing_data/chrome_browsing_data_remover_delegate_unittest.cc b/chrome/browser/browsing_data/chrome_browsing_data_remover_delegate_unittest.cc
index 9bec3cef1078dae48f7cd38ec48165765c774ef9..a15293a7660096361cc83a257b80ea2b1968c475 100644
--- a/chrome/browser/browsing_data/chrome_browsing_data_remover_delegate_unittest.cc
+++ b/chrome/browser/browsing_data/chrome_browsing_data_remover_delegate_unittest.cc
@@ -1382,8 +1382,6 @@ TEST_F(ChromeBrowsingDataRemoverDelegateTest, ZeroSuggestCacheClear) {
 #if defined(OS_CHROMEOS)
 TEST_F(ChromeBrowsingDataRemoverDelegateTest,
        ContentProtectionPlatformKeysRemoval) {
-  chromeos::ScopedTestDeviceSettingsService test_device_settings_service;
-  chromeos::ScopedTestCrosSettings test_cros_settings;

[stevenjb, 2017/05/24 20:08:52]

Are these changes related? Can they be separated?

[Alexander Alekseev, 2017/05/25 00:30:05]

ChromeOS preferences are now tied to CrosSettings (to make user timezone 
default to current timezone to make transition correct), and to
components/user_manager .

This means that TestingProfile now needs CrosSettings and UserManager (for
GetProfileByUser() ) to run.

So it was reasonable to initialize them all in TestingProfile. Than we need to
remove duplicate initialization from the tests that had it previously.

It also turned out, that TestingProfile is used also in browser_tests and
interactive_ui_tests. So it now initializes only objects that has not been
already initialized.

UserManager did not support running in unit_tests (this is now fixed in this
CL).


Then, there was an incorrect object initialization sequence in one test, and a
bug in chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.cc .


We can move tests update to a separate CL, but it won't be obvious why it is
done.

   chromeos::MockUserManager* mock_user_manager =
       new testing::NiceMock<chromeos::MockUserManager>();
   mock_user_manager->SetActiveUser(