Mark kOtherLaunch and kOtherClose as terminal states for the inactive user toast.

This prevents showing the toast to the user a second time in these cases.

BUG=786918
R=skare@chromium.org

Change-Id: I8858e7cb1acc247c011494cd4d446a75f19e18a9
Reviewed-on: https://chromium-review.googlesource.com/778844
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517825}

chrome/installer/util/experiment_metrics.cc

@@ -11,9 +11,11 @@ bool ExperimentMetrics::InInitialState() const {
 }
 
 bool ExperimentMetrics::InTerminalState() const {
+  static_assert(NUM_STATES == 18,
+                "update the list of terminal states when adding a new state.");
   return state == kSelectedNoThanks || state == kSelectedOpenChromeAndCrash ||
          state == kSelectedOpenChromeAndNoCrash || state == kSelectedClose ||
-         state == kUserLogOff;
+         state == kUserLogOff || state == kOtherLaunch || state == kOtherClose;
 }
 
 bool ExperimentMetrics::operator==(const ExperimentMetrics& other) const {