Gallery.app: Remove old gallery from Files.app.

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <message name="IDS_CHROMEBOOK" desc="The localized name for Chromebook.">
     Chromebook
   </message>
   <message name="IDS_CHROMEBOX" desc="The localized name for Chromebox">
@@ skipping 67 matching lines @@
     Current wallpaper is set by '<ph name="APP_NAME">$1</ph>'
   </message>
 
   <!-- File Manager -->
   <message name="IDS_FLAGS_ENABLE_FILE_MANAGER_MTP_NAME" desc="Name of the about:flag option to enable MTP support in file manager.">
     Enable MTP support in File Manager.
   </message>
   <message name="IDS_FLAGS_ENABLE_FILE_MANAGER_MTP_DESCRIPTION" desc="Description of the about:flag option to the enable MTP support in file manager.">
     Show MTP devices as a file storage in the file manager.
   </message>
-  <message name="IDS_FLAGS_FILE_MANAGER_ENABLE_NEW_GALLERY_NAME" desc="Name of the about:flag option to enable the new gallery app.">
-    Enable the new gallery
-  </message>
-  <message name="IDS_FLAGS_FILE_MANAGER_ENABLE_NEW_GALLERY_DESCRIPTION" desc="Description of the about:flag option to the enable new gallery app.">
-    Use the experimental new gallery instead of the stable one.
-  </message>
   <message name="IDS_FLAGS_ENABLE_VIDEO_PLAYER_CHROMECAST_SUPPORT_NAME" desc="Name of the about:flag option to enable the chromecast support for video app.">
     Experimental Chromecast support for Video Player
   </message>
   <message name="IDS_FLAGS_ENABLE_VIDEO_PLAYER_CHROMECAST_SUPPORT_DESCRIPTION" desc="Description of the about:flag option to the enable the chromecast support for video app.">
     This option enables experimental Chromecast support for Video Player app on ChromeOS.
   </message>
   <message name="IDS_FILE_SYSTEM_PROVIDER_UNRESPONSIVE_WARNING" desc="A warning shown in a notification that an operation is taking longer than expected.">
     An operation is taking longer than expected. Do you want to abort it?
   </message>
   <message name="IDS_FILE_SYSTEM_PROVIDER_MANY_UNRESPONSIVE_WARNING" desc="A warning shown in a notification that more than one operations are taking longer than expected.">
@@ skipping 5648 matching lines @@
   <message name="IDS_SET_TIME_BUTTON_CLOSE" desc="Text for the button to close the window.">
     Done
   </message>
   <message name="IDS_SET_TIME_DATE_LABEL" desc="Label for the date input element.">
     System date
   </message>
   <message name="IDS_SET_TIME_TIME_LABEL" desc="Label for the time input element.">
     System time
   </message>
 </grit-part>