Enable MD storage manager by default.

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>
   <!-- Idle logout dialog for retail mode -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog. Used in retail mode only.">
     Are you still there?
   </message>
@@ skipping 1386 matching lines @@
   </message>
   <message name="IDS_FLAGS_WAKE_ON_PACKETS_DESCRIPTION" desc="Description for the flag to enable wake on packets.">
     Enables waking the device based on the receipt of some network packets.
   </message>
   <message name="IDS_FLAGS_FULLSCREEN_APP_LIST_NAME" desc="Description for the flag to enable experimental fullscreen app list.">
     Enables the fullscreen app-list in touch-view mode.
   </message>
   <message name="IDS_FLAGS_FULLSCREEN_APP_LIST_DESCRIPTION" desc="Description for the flag to enable experimental fullscreen app list.">
     The app-list will appear as fullscreen mode when it's in touch view mode. This flag does nothing outside of the mode.
   </message>
-  <message name="IDS_FLAGS_MD_STORAGE_MANAGER_NAME" desc="Description for the flag to enable experimental storage manager.">
-    Material Design storage manager
-  </message>
-  <message name="IDS_FLAGS_MD_STORAGE_MANAGER_DESCRIPTION" desc="Description for the flag to enable experimental storage manager.">
-    Enables storage manager in Material Design Settings.
-  </message>
   <message name="IDS_FLAGS_QUICK_UNLOCK_PIN" desc="Title of the flag used to enable quick unlock pin.">
     Quick Unlock (PIN)
   </message>
   <message name="IDS_FLAGS_QUICK_UNLOCK_PIN_DESCRIPTION" desc="Description of the flag used to enable quick unlock pin.">
     Enabling PIN quick unlock allows you to use a PIN to unlock your Chromebook on the lock screen after you have signed into your device.
   </message>
   <message name="IDS_OFFERS_CONSENT_INFOBAR_LABEL_LEARN_MORE" desc="Text of the Learn More link in the echo dialog.">
     Learn More
   </message>
   <message name="IDS_OFFERS_CONSENT_INFOBAR_ENABLE_BUTTON" desc="Enable button label.">
@@ skipping 5119 matching lines @@
   </message>
   <message name="IDS_FLAGS_ENABLE_EHV_INPUT_NAME" desc="Name of the about: flag for enabling emoji, handwriting and voice input on opt-in IME menu.">
     Emoji, handwriting and voice input on opt-in IME menu
     </message>
   <message name="IDS_FLAGS_ENABLE_EHV_INPUT_DESCRIPTION" desc="Description of the about: flag enabling emoji, handwriting and voice input on opt-in IME menu.">
     Enable access to emoji, handwriting and voice input form opt-in IME menu.
   </message>
   <message name="IDS_HATS_DONE_BUTTON_LABEL" desc="Label used for the done button at the end of survey">
     Done
   </message>
-  
+
   <!-- Print Job Notification -->
   <message name="IDS_PRINT_JOB_WAITING_NOTIFICATION_MESSAGE" desc="Message of the waiting-for-printing notification.">
     Waiting to print <ph name="PAGE_NUMBER">$1<ex>5</ex></ph> pages to <ph name="PRINTER_NAME">$2<ex>printer</ex></ph>
   </message>
   <message name="IDS_PRINT_JOB_PRINTING_NOTIFICATION_MESSAGE" desc="Message of the printing-in-progress notification.">
     Now printing <ph name="PAGE_NUMBER">$1<ex>5</ex></ph> pages to <ph name="PRINTER_NAME">$2<ex>printer</ex></ph>
   </message>
   <message name="IDS_PRINT_JOB_DONE_NOTIFICATION_MESSAGE" desc="Message of the successful printing notitification.">
     Successfully printed <ph name="PAGE_NUMBER">$1<ex>5</ex></ph> pages to <ph name="PRINTER_NAME">$2<ex>printer</ex></ph>
   </message>
   <message name="IDS_PRINT_JOB_ERROR_NOTIFICATION_MESSAGE" desc="Message of the error printing notification.">
-    Error printing <ph name="PAGE_NUMBER">$1<ex>5</ex></ph> pages to <ph name="PRINTER_NAME">$2<ex>printer</ex></ph> 
+    Error printing <ph name="PAGE_NUMBER">$1<ex>5</ex></ph> pages to <ph name="PRINTER_NAME">$2<ex>printer</ex></ph>
   </message>
   <message name="IDS_PRINT_JOB_NOTIFICATION_CANCEL_BUTTON" desc="Text on the button for the user to cancel the current print job.">
     Cancel printing
   </message>
   <message name="IDS_PRINT_JOB_NOTIFICATION_PAUSE_BUTTON" desc="Text on the button for the user to pause the current print job.">
     Pause printing
   </message>
   <message name="IDS_PRINT_JOB_NOTIFICATION_RESUME_BUTTON" desc="Text on the button for the user to resume the current print job.">
     Resume printing
   </message>
   <message name="IDS_PRINT_JOB_NOTIFICATION_GET_HELP_BUTTON" desc="Text on the button for the user to get help about the current print job.">
     Get help
   </message>
 </grit-part>