Delete unused onSignOut method

Once upon a time Gerrit performed a sign-out by just deleting the
cookie and updating the DOM to remove signed-in content. This is
not true anymore, the entire page is refreshed to delete any data
that is private to a signed-in account, and to ensure the server
can clear the correct HttpOnly cookies to actually do a sign-out.

Since that behavior change, this onSignOut method is dead code.

Change-Id: I7d7922f3a38fdcd03615866d0d693088660e1a31

gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/ChangeScreen.java

diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/ChangeScreen.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/ChangeScreen.java
index 8d5e105..b054175 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/ChangeScreen.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/ChangeScreen.java
@@ -118,14 +118,6 @@
   }
 
   @Override
-  public void onSignOut() {
-    super.onSignOut();
-    if (starChange != null) {
-      starChange.setVisible(false);
-    }
-  }
-
-  @Override
   protected void onLoad() {
     super.onLoad();
     detailCache.refresh();

gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/Screen.java

diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/Screen.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/Screen.java
index 5cb4727..7f5eead 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/Screen.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/ui/Screen.java
@@ -15,8 +15,6 @@
 package com.google.gerrit.client.ui;
 
 import com.google.gerrit.client.Gerrit;
-import com.google.gerrit.common.PageLinks;
-import com.google.gwt.user.client.History;
 import com.google.gwt.user.client.ui.FlowPanel;
 import com.google.gwt.user.client.ui.Grid;
 import com.google.gwt.user.client.ui.HasHorizontalAlignment;
@@ -148,13 +146,6 @@
     return requiresSignIn;
   }
 
-  /** Invoked if this screen is the current screen and the user signs out. */
-  public void onSignOut() {
-    if (isRequiresSignIn()) {
-      History.newItem(PageLinks.toChangeQuery("status:open"));
-    }
-  }
-
   public void onShowView() {
     if (windowTitle != null) {
       Gerrit.setWindowTitle(this, windowTitle);