Enable the Windows 10 inactive user toast experiment.

BUG=717091
R=nikunjb@chromium.org, skare@chromium.org

Change-Id: I1e8d1d9ac4dd7f5f9e1feb80aaad38dfea6ba7cc
Reviewed-on: https://chromium-review.googlesource.com/544817
Commit-Queue: Greg Thompson <grt@chromium.org>
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517041}

chrome/installer/setup/user_experiment.cc

@@ -53,17 +53,10 @@ constexpr ExperimentStorage::Study kCurrentStudy = ExperimentStorage::kStudyOne;
 constexpr int kStudyTwoGroup = 0;
 
 // Test switches.
-constexpr char kExperimentEnableForTesting[] = "experiment-enable-for-testing";
 constexpr char kExperimentEnterpriseBypass[] = "experiment-enterprise-bypass";
 constexpr char kExperimentParticipation[] = "experiment-participation";
 constexpr char kExperimentRetryDelay[] = "experiment-retry-delay";
 
-// Returns true if the experiment is enabled for testing.
-bool IsExperimentEnabledForTesting() {
-  return base::CommandLine::ForCurrentProcess()->HasSwitch(
-      kExperimentEnableForTesting);
-}
-
 // Returns true if the install originated from the MSI or if the machine is
 // joined to a domain. This check can be bypassed via
 // --experiment-enterprise-bypass.
@@ -236,11 +229,8 @@ bool ShouldRunUserExperiment(const InstallerState& installer_state) {
 
   // Bail out if this install is not selected into the fraction participating in
   // the current study.
-  // NOTE: No clients will participate while this feature is under development.
-  if (!IsExperimentEnabledForTesting() ||
-      !IsSelectedForStudy(lock.get(), kCurrentStudy)) {
+  if (!IsSelectedForStudy(lock.get(), kCurrentStudy))
     return false;
-  }
 
   // Skip the experiment if a user on the machine has already reached a terminal
   // state.