Remove deprecation warning banner from App Launcher code.

chrome/app/chromium_strings.grd

Index: chrome/app/chromium_strings.grd
diff --git a/chrome/app/chromium_strings.grd b/chrome/app/chromium_strings.grd
index 5f7dc666eb51d4aa03c16e3b0ea114ae5b799ce7..e791254738d3c2f301982589c665895fb31f2acc 100644
--- a/chrome/app/chromium_strings.grd
+++ b/chrome/app/chromium_strings.grd
@@ -905,14 +905,6 @@ Signing in anyway will merge Chromium information like bookmarks, history, and o
             Remove From Chromium...
           </message>
         </if>
-        <if expr="not chromeos">
-          <message name="IDS_APP_LIST_MESSAGE_TITLE" desc="Title given to the message displayed in the app launcher to say it is going away">
-            The Chromium App Launcher is going away.
-          </message>
-          <message name="IDS_APP_LIST_MESSAGE_TEXT" desc="The message body text displayed in the app launcher to say it is going away">
-            Use the <ph name="APPS_ICON_IMAGE">$1<ex>Apps</ex></ph> shortcut in the Chromium bookmarks bar to continue accessing your apps.
-          </message>
-        </if>
       </if>
 
       <!-- App shortcuts -->