[Metrics] Enable FamilyLinkUserMetricsProvider

This CL enables the feature flag for FamilyLinkUserMetricsProvider.

Bug: 1136304
Change-Id: I62ad64ad402350f7d0b0415a004b4ca1186745ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495609
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Auto-Submit: Toby Huang <tobyhuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821369}

chrome/browser/chromeos/child_accounts/family_features.cc

@@ -10,6 +10,6 @@ const base::Feature kFamilyUserMetricsProvider{
     "FamilyUserMetricsProvider", base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kFamilyLinkUserMetricsProvider{
-    "FamilyLinkUserMetricsProvider", base::FEATURE_DISABLED_BY_DEFAULT};
+    "FamilyLinkUserMetricsProvider", base::FEATURE_ENABLED_BY_DEFAULT};
 
 }  // namespace chromeos

chrome/browser/metrics/chrome_metrics_service_client_unittest.cc

@@ -183,8 +183,9 @@ TEST_F(ChromeMetricsServiceClientTest, TestRegisterMetricsServiceProviders) {
   // AmbientModeMetricsProvider, AssistantServiceMetricsProvider,
   // CrosHealthdMetricsProvider, ChromeOSMetricsProvider,
   // SigninStatusMetricsProviderChromeOS, PrinterMetricsProvider,
-  // HashedLoggingMetricsProvider, and FamilyUserMetricsProvider.
-  expected_providers += 8;
+  // HashedLoggingMetricsProvider, FamilyUserMetricsProvider, and
+  // FamilyLinkUserMetricsProvider.
+  expected_providers += 9;
 #endif  // defined(OS_CHROMEOS)
 
 #if !defined(OS_CHROMEOS)