Add the about_page key to shared_module manifest

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.  The variables is_win, is_macosx, is_linux, and is_posix are available
 for making strings OS specific.  Other platform defines such as use_titlecase
 are declared in build/common.gypi.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 2169 matching lines @@
         <message name="IDS_APPLICATION_INFO_WEB_STORE_LINK" desc="In Title Case: Text for the link that opens the app in the Web Store..">
           View in Web Store
         </message>
         <message name="IDS_APPLICATION_INFO_CREATE_SHORTCUTS_BUTTON_TEXT" desc="In Title Case: Text for the button that opens the dialog to create shortcuts for the app.">
           Create Shortcuts
         </message>
         <message name="IDS_APPLICATION_INFO_UNINSTALL_BUTTON_TEXT" desc="In Title Case: Text for the button that uninstalls the app.">
           Uninstall
         </message>
       </if>
+      <message name="IDS_APPLICATION_INFO_IMPORTED_MODULES_TITLE_TEXT" desc="Text for the title above the imported modules for the app. Imported modules are like shared libraries that an app has used when it was built (but are not directly accessible by a user).">
+        This app imports the following modules:
+      </message>
+      <message name="IDS_APPLICATION_INFO_IMPORTED_MODULES_ABOUT_LINK_TEXT" desc="Text for the link next to each imported module that goes to the About page for that module. The About page may include things such as open-source and copyright licenses for the app.">
+        About
+      </message>
       <message name="IDS_APPLICATION_INFO_REQUIRED_PERMISSIONS_TEXT" desc="Heading for the required permissions for the app (the permissions that the user must grant the app upon installation).">
         Required
       </message>
       <message name="IDS_APPLICATION_INFO_OPTIONAL_PERMISSIONS_TEXT" desc="Heading for the optional permissions for the app (the permissions that the user may choose to grant the app, but are not required for the basic app's functionality).">
         Optional
       </message>
       <message name="IDS_APPLICATION_INFO_RETAINED_FILE_PERMISSIONS_TEXT" desc="Heading for the retained files for the app, which are files the app has permanent access to (the app can read and write to these files).">
         Files
       </message>
       <message name="IDS_APPLICATION_INFO_REVOKE_RETAINED_FILE_PERMISSIONS_BUTTON_TEXT" desc="Text displayed in the button to remove the app's file permissions. After pressing this button, the app no longer has access to the files.">
@@ skipping 2337 matching lines @@
       </message>
       <message name="IDS_EXTENSION_LOAD_ICON_FOR_PAGE_ACTION_FAILED" desc="">
         Could not load icon '<ph name="ICON">$1<ex>icon.png</ex></ph>' for page action.
       </message>
       <message name="IDS_EXTENSION_LOAD_ICON_FOR_BROWSER_ACTION_FAILED" desc="">
         Could not load icon '<ph name="ICON">$1<ex>icon.png</ex></ph>' for browser action.
       </message>
       <message name="IDS_EXTENSION_LOAD_OPTIONS_PAGE_FAILED" desc="">
         Could not load options page '<ph name="OPTIONS_PAGE">$1<ex>page.html</ex></ph>'.
       </message>
+      <message name="IDS_EXTENSION_LOAD_ABOUT_PAGE_FAILED" desc="">
+        Could not load about page '<ph name="ABOUT_PAGE">$1<ex>page.html</ex></ph>'.
+      </message>
       <if expr="is_win">
         <message name="IDS_EXTENSION_UNPACK_FAILED" desc="On windows, it is possible to mount a disk without the root of that disk having a drive letter.  The sandbox does not support this. See crbug/49530 .">
           Can not unpack extension.  To safely unpack an extension, there must be a path to your profile directory that starts with a drive letter and does not contain a junction, mount point, or symlink.  No such path exists for your profile.
         </message>
       </if>
       <if expr="not is_win">
         <message name="IDS_EXTENSION_UNPACK_FAILED" desc="">
           Can not unpack extension.  To safely unpack an extension, there must be a path to your profile directory that does not contain a symlink.  No such path exists for your profile.
         </message>
       </if>
@@ skipping 9601 matching lines @@
     <message name="IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_ENFORCE" desc="Description of the 'Extension Content Verification' enforce mode">
       Enforce (try to get hashes, and enforce them if successful)
     </message>
 
     <message name="IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_ENFORCE_STRICT" desc="Description of the 'Extension Content Verification' enforce strict mode">
       Enforce strict (hard fail if we can't get hashes)
     </message>
   </messages>
   </release>
 </grit>