Add support for webapk without runtimeHost

chrome/android/webapk/strings/android_webapk_strings.grd

Index: chrome/android/webapk/strings/android_webapk_strings.grd
diff --git a/chrome/android/webapk/strings/android_webapk_strings.grd b/chrome/android/webapk/strings/android_webapk_strings.grd
index 40f53e59de0f492cda77f5c8c194b01144f27351..0f131e56472e66d91aef3ac11a25378152bab42a 100644
--- a/chrome/android/webapk/strings/android_webapk_strings.grd
+++ b/chrome/android/webapk/strings/android_webapk_strings.grd
@@ -100,7 +100,9 @@
       <message name="IDS_CHOOSE_HOST_BROWSER" desc="Content for the host browser picker dialog, which is used to ask users to pick a browser to launch the installed WebAPK.">
         Please select the browser you'd like to use to run <ph name="WEBAPK_SITE">%1$s<ex>Housing.com</ex></ph>
       </message>
-      
+      <message name="IDS_CHOOSE_HOST_BROWSER_DIALOG_QUIT" desc="Text for the cancel button on the dialog. ">
+        QUIT
+      </message>
     </messages>
   </release>
 </grit>