Fix OSSettingsPeoplePageAccountManagerTest

Fix flakiness of OSSettingsPeoplePageAccountManagerTest.AllJsTests. In
some tests we override isChild property in JS from false to true, but
in C++ we set accountManagerPrimaryAccountChildManagedTooltip string
only if is it was initially true. Fix this by adding string to
loadTimeData for all users (is user is not child - it's going to be
empty).

Fixed: 1087207
Change-Id: I20ae9f89bfe6646e74073632f8eafa02950f514d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2224262
Commit-Queue: Anastasiia N <anastasiian@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775085}

chrome/browser/ui/webui/settings/chromeos/people_section.cc

@@ -587,6 +587,7 @@ void AddParentalControlStrings(content::WebUIDataSource* html_source,
   bool is_child = user_manager::UserManager::Get()->IsLoggedInAsChildUser();
   html_source->AddBoolean("isChild", is_child);
 
+  base::string16 tooltip;
   if (is_child) {
     std::string custodian = supervised_user_service->GetCustodianName();
     std::string second_custodian =
@@ -602,9 +603,10 @@ void AddParentalControlStrings(content::WebUIDataSource* html_source,
           IDS_SETTINGS_ACCOUNT_MANAGER_CHILD_MANAGED_BY_TWO_PARENTS_TOOLTIP,
           base::UTF8ToUTF16(custodian), base::UTF8ToUTF16(second_custodian));
     }
-    html_source->AddString("accountManagerPrimaryAccountChildManagedTooltip",
-                           child_managed_tooltip);
+    tooltip = child_managed_tooltip;
   }
+  html_source->AddString("accountManagerPrimaryAccountChildManagedTooltip",
+                         tooltip);
 }
 
 }  // namespace

chrome/test/data/webui/settings/chromeos/os_settings_browsertest.js

@@ -954,7 +954,7 @@ var OSSettingsPeoplePageAccountManagerTest =
   }
 };
 
-TEST_F('OSSettingsPeoplePageAccountManagerTest', 'DISABLED_AllJsTests', () => {
+TEST_F('OSSettingsPeoplePageAccountManagerTest', 'AllJsTests', () => {
   mocha.run();
 });