Accessibility shortcut primary action - remove search and help icon

* Show search and help page only for accessibility framework feature. Framework don't know the information for downloaded accessibility.
* Modify MagnificationPreferenceFragment to use same logic.

Bug: 142531433
Bug: 150130421
Test: manual test
Change-Id: I29ab5080acc035f46f1e816a9df1b46020bc356c

src/com/android/settings/accessibility/LaunchAccessibilityActivityPreferenceFragment.java

@@ -27,6 +27,8 @@ import android.net.Uri;
 import android.os.Bundle;
 import android.os.UserHandle;
 import android.util.Log;
+import android.view.Menu;
+import android.view.MenuInflater;
 import android.view.View;
 import android.view.accessibility.AccessibilityManager;
 
@@ -90,6 +92,13 @@ public class LaunchAccessibilityActivityPreferenceFragment extends
         showDialog(DialogEnums.EDIT_SHORTCUT);
     }
 
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        // Do not call super. We don't want to see the "Help & feedback" option on this page so as
+        // not to confuse users who think they might be able to send feedback about a specific
+        // accessibility service from this page.
+    }
+
     @Override
     protected void updateToggleServiceTitle(SwitchPreference switchPreference) {
         final AccessibilityShortcutInfo info = getAccessibilityShortcutInfo();