Enable profile switching for standalone App Launcher via the Settings App.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index ef3ab83691b4d3eb4c35eed8327fd09d9cc501ab..8f37972aad15003dfe60e651e8dcf84cdfad6489 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -5651,11 +5651,14 @@ Keep your key file in a safe place. You will need it to create new versions of y
         Remove from Chrome
       </message>
 
-      <!-- chrome://settings-frame/options_settings_app.html for the App Launcher (Windows only) -->
+      <!-- chrome://settings-frame/options_settings_app.html for the App Launcher Settings App -->
       <if expr="pp_ifdef('enable_settings_app')">
         <message name="IDS_SETTINGS_APP_LAUNCHER_PRODUCT_NAME" desc="Product name to use when referring to applications running in the App Launcher inside the non-browser Settings App">
           App Launcher
         </message>
+        <message name="IDS_SETTINGS_APP_PROFILES_SWITCH_BUTTON_LABEL" desc="The label that appears on the profile switch user button in the Settings App to allow a user to switch the app launcher profile to the current selection.">
+          Switch user
+        </message>
         <message name="IDS_SETTINGS_APP_SYNC_OVERVIEW" desc="The message that appears in the non-browser Settings App when sync has not been set up by the user.">
           Sign in with your Google Account to allow apps to synchronize settings and provide other customized services.
         </message>