Migrate about:flags messages to const char*

ios/chrome/app/strings/ios_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains definition of resources that will be translated for each
 locale.  The strings in this file are specific to iOS.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       output_all_resource_defines="false" source_lang_id="en" enc_check="möl">
   <outputs>
@@ skipping 617 matching lines @@
       </message>
       <message name="IDS_IOS_FACETIME_BUTTON" desc="Text in the confirmation dialog button that will initiate a FaceTime call for the presented number. [Length: 10em] [iOS only]">
         FaceTime
       </message>
       <message name="IDS_IOS_FIRSTRUN_ACCOUNT_CONSISTENCY_SKIP_BUTTON" desc="Title of the button to skip the selection of an account on First Run when account consistency is enabled. [Length: 10em] [iOS only]">
         No thanks
       </message>
       <message name="IDS_IOS_FIRSTRUN_OPT_IN_ACCEPT_BUTTON" desc="User metrics opt-in acceptance button label [iOS only]">
         Accept &amp; Continue
       </message>
-      <message name="IDS_IOS_FLAGS_BROWSER_TASK_SCHEDULER_DESCRIPTION" desc="Description of about:flag option to control redirection to the task scheduler." translateable="false">
-        Enables redirection of some task posting APIs to the task scheduler.
-      </message>
-      <message name="IDS_IOS_FLAGS_BROWSER_TASK_SCHEDULER_NAME" desc="Name of about:flag option to control redirection to the task scheduler." translateable="false">
-        Task Scheduler
-      </message>
-      <message name="IDS_IOS_FLAGS_CONTEXTUAL_SEARCH" desc="Title for the flag to enable Contextual Search.">
-        Contextual Search
-      </message>
-      <message name="IDS_IOS_FLAGS_CONTEXTUAL_SEARCH_DESCRIPTION" desc="Description for the flag to enable Contextual Search.">
-        Whether or not Contextual Search is enabled.
-      </message>
-      <message name="IDS_IOS_FLAGS_PHYSICAL_WEB" desc="Title for the flag to enable Physical Web in the omnibox.">
-        Physical Web
-      </message>
-      <message name="IDS_IOS_FLAGS_PHYSICAL_WEB_DESCRIPTION" desc="Description for the flag to enable Physical Web in the omnibox.">
-        When enabled, the omnibox will include suggestions for web pages broadcast by devices near you.
-      </message>
       <message name="IDS_IOS_GENERATED_PASSWORD_ACCEPT" desc="The text of the button that accepts the generated password. [Length: 20em] [iOS only]">
         Use Password
       </message>
       <message name="IDS_IOS_GENERATED_PASSWORD_PROMPT_DESCRIPTION" desc="The explanation text for the generated password prompt. [iOS only]">
         Chrome will store this in your <ph name="BEGIN_LINK">BEGIN_LINK</ph>Google saved passwords<ph name="END_LINK">END_LINK</ph> and autofill it for you so you don't have to remember it yourself.
       </message>
       <message name="IDS_IOS_GENERATED_PASSWORD_PROMPT_TITLE" desc="The text of the button that accepts the generated password. [Length: 20em] [iOS only]">
         Password Generated by Chrome
       </message>
       <message name="IDS_IOS_GENERATE_PASSWORD_LABEL" desc="Input accessory view label to generate a password. [Length: 20em] [iOS only]">
@@ skipping 846 matching lines @@
       </message>
       <message name="IDS_IOS_SIGNIN_PROMO_CONTINUE_AS" desc="Button that the user can press to login without asking the password and continue using Chrome with this acccount. [Length: 9em]">
         Continue as <ph name="NAME">$1<ex>John Doe</ex></ph>
       </message>
       <message name="IDS_IOS_SIGNIN_PROMO_NOT" desc="Button that the user can press if they are not the profile that Chrome found (opposite of 'Continue as Joe Doe').">
         Not <ph name="EMAIL">$1<ex>john.doe@example.com</ex>?</ph>
       </message>
     </messages>
   </release>
 </grit>