Hide the "Move to other window" menu option when there is only one tab

chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuPropertiesDelegate.java

Index: chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuPropertiesDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuPropertiesDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuPropertiesDelegate.java
index 529b7d689639020b2ce80342b3cf3e6627ce45aa..6d0529a89bc7aecefc991494bf7f4ee2538ba244 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuPropertiesDelegate.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuPropertiesDelegate.java
@@ -136,8 +136,10 @@ public class AppMenuPropertiesDelegate {
             menu.findItem(R.id.update_menu_id).setVisible(
                     UpdateMenuItemHelper.getInstance().shouldShowMenuItem(mActivity));
 
+            boolean hasMoreThanOneTab = mActivity.getTabModelSelector().getTotalTabCount() > 1;
             menu.findItem(R.id.move_to_other_window_menu_id).setVisible(
-                    MultiWindowUtils.getInstance().isOpenInOtherWindowSupported(mActivity));
+                    MultiWindowUtils.getInstance().isOpenInOtherWindowSupported(mActivity)
+                    && hasMoreThanOneTab);
 
             MenuItem recentTabsMenuItem = menu.findItem(R.id.recent_tabs_menu_id);
             recentTabsMenuItem.setVisible(!isIncognito);