Only allow installation of extensions/apps with gallery update url via download from gallery

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- This file contains definitions of resources that will be translated for
 each locale. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/generated_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 3355 matching lines @@
         Your browsing history
       </message>
       <message name="IDS_EXTENSION_PROMPT2_WARNING_GEOLOCATION" desc="Permisson string for access to geolocation.">
         Your physical location
       </message>
 
       <!-- Extension error messages -->
       <message name="IDS_EXTENSION_DIRECTORY_NO_EXISTS" desc="Warning displayed in pack dialog when the extension directory does not exist.">
         Input directory must exist.
       </message>
+      <message name="IDS_EXTENSION_DISALLOW_NON_DOWNLOADED_GALLERY_INSTALLS" desc="Error displayed when an extension that has an update URL used by the gallery is installed when not directly downloaded from the gallery.">
+        This package can only be installed from the <ph name="CHROME_WEB_STORE">$1<ex>Chrome Web Store</ex></ph>.
+      </message>
       <message name="IDS_EXTENSION_PRIVATE_KEY_INVALID_PATH" desc="Warning displayed in pack dialog when the private key must be a valid path.">
         Input value for private key must be a valid path.
       </message>
       <message name="IDS_EXTENSION_PRIVATE_KEY_EXISTS" desc="Warning displayed in pack dialog when the private key for the extension already exists.">
         A private key for specified extension already exists. Reuse that key or delete it first.
       </message>
       <message name="IDS_EXTENSION_PRIVATE_KEY_NO_EXISTS" desc="Warning displayed in pack dialog when the private key for the extension does not exist.">
         Input value for private key must exist.
       </message>
       <message name="IDS_EXTENSION_PRIVATE_KEY_FAILED_TO_READ" desc="Warning displayed in pack dialog when was not possible to read the private key of the extension.">
@@ skipping 234 matching lines @@
 
       <message name="IDS_EXTENSION_PROMPT_INSTALL_BUTTON" desc="Text for the install button on the extension install prompt">
         Install
       </message>
       <message name="IDS_EXTENSION_PROMPT_UNINSTALL_BUTTON" desc="Text for the uninstall button on the extension uninstall prompt">
         Uninstall
       </message>
       <message name="IDS_EXTENSION_PROMPT_ENABLE_INCOGNITO_BUTTON" desc="Text for the allow button on the extension run-in-incognito prompt">
         Allow
       </message>
+      <message name="IDS_EXTENSION_WEB_STORE_TITLE" desc="Text for the Chrome Web Store">
+        Chrome Web Store
+      </message>
 
       <!-- chrome://plugins page -->
       <message name="IDS_PLUGINS_TITLE" desc="Title for the chrome://plugins page.">
         Plug-ins
       </message>
       <message name="IDS_PLUGINS_DETAILS_MODE_LINK" desc="Text of the link for details mode.">
         Details
       </message>
       <message name="IDS_PLUGINS_NONE_INSTALLED" desc="Text that lets the user know that no plug-ins are installed.">
         No plug-ins installed.
@@ skipping 4860 matching lines @@
 
     </messages>
 
     <structures first_id="50000" fallback_to_english="true">
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
 
   </release>
 </grit>