Bug 1258472 - 1. Start first-run telemetry session outside of GeckoProfile; r=nalexander

Move the first-run telemetry session from GeckoProfile to BrowserApp, so
there is no longer any dependency on Telemetry from inside GeckoProfile.

mobile/android/base/java/org/mozilla/gecko/BrowserApp.java

@@ -933,8 +933,14 @@ public class BrowserApp extends GeckoApp
                         });
                     }
                 }
+
                 // Don't bother trying again to show the v1 minimal first run.
                 prefs.edit().putBoolean(FirstrunAnimationContainer.PREF_FIRSTRUN_ENABLED, false).apply();
+
+                // We have no intention of stopping this session. The FIRSTRUN session
+                // ends when the browsing session/activity has ended. All events
+                // during firstrun will be tagged as FIRSTRUN.
+                Telemetry.startUISession(TelemetryContract.Session.FIRSTRUN);
             }
         } finally {
             StrictMode.setThreadPolicy(savedPolicy);

mobile/android/geckoview/src/main/java/org/mozilla/gecko/GeckoProfile.java

@@ -938,11 +938,6 @@ public final class GeckoProfile {
         if (!isDefaultSet) {
             // only set as default if this is the first profile we're creating
             profileSection.setProperty("Default", 1);
-
-            // We have no intention of stopping this session. The FIRSTRUN session
-            // ends when the browsing session/activity has ended. All events
-            // during firstrun will be tagged as FIRSTRUN.
-            Telemetry.startUISession(TelemetryContract.Session.FIRSTRUN);
         }
 
         parser.addSection(profileSection);