Bug 1035436 - Remove home.1 session because it's not useful r=liuche

mobile/android/base/TelemetryContract.java

@@ -185,9 +185,6 @@ public interface TelemetryContract {
         // Awesomescreen frecency search is active.
         FRECENCY("frecency.1"),
 
-        // Started when a user enters about:home.
-        HOME("home.1"),
-
         // Started when a user enters a given home panel.
         // Session name is dynamic, encoded as "homepanel.1:<panel_id>"
         HOME_PANEL("homepanel.1"),

mobile/android/base/home/HomePager.java

@@ -231,7 +231,6 @@ public class HomePager extends ViewPager {
                             PropertyAnimator.Property.ALPHA,
                             1.0f);
         }
-        Telemetry.startUISession(TelemetryContract.Session.HOME);
     }
 
     /**
@@ -244,7 +243,6 @@ public class HomePager extends ViewPager {
 
         // Stop UI Telemetry sessions.
         stopCurrentPanelTelemetrySession();
-        Telemetry.stopUISession(TelemetryContract.Session.HOME);
     }
 
     /**