Increase Request Mobile Site character limit to 25em.

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 1435 matching lines @@
       </message>
       <message name="IDS_IOS_TOOLS_MENU_READING_LIST" desc="The iOS menu item for opening the reading list [Length: 15em] [iOS only]">
         Reading List
       </message>
       <message name="IDS_IOS_TOOLS_MENU_RECENT_TABS" desc="The iOS menu item for opening the panel showing the recently closed tabs and the tabs from other devices. [Length: 15em] [iOS only]">
         Recent Tabs
       </message>
       <message name="IDS_IOS_TOOLS_MENU_REQUEST_DESKTOP_SITE" desc="The iOS menu item for requesting the desktop site [Length: 15em] [iOS only]">
         Request Desktop Site
       </message>
-      <message name="IDS_IOS_TOOLS_MENU_REQUEST_MOBILE_SITE" desc="The iOS menu item for requesting the mobile site [Length: 15em] [iOS only]">
+      <message name="IDS_IOS_TOOLS_MENU_REQUEST_MOBILE_SITE" desc="The iOS menu item for requesting the mobile site [Length: 25em] [iOS only]">

[Eugene But (OOO till 7-30), 2017/04/07 16:49:41]

Are there any existing tools items that have 25em limit? I'm worrying that 25
could make the menu very wide.

         Request Mobile Site
       </message>
       <message name="IDS_IOS_TOOLS_MENU_SETTINGS" desc="The iOS menu item for opening the settings [Length: 15em] [iOS only]">
         Settings
       </message>
       <message name="IDS_IOS_TOOLS_MENU_SHARE" desc="The iOS menu item for sharing the current URL [Length: 15em] [iOS only]">
         Share...
       </message>
       <message name="IDS_IOS_TOOLS_MENU_SUGGESTIONS" desc="The iOS menu item for displaying the Suggestions UI [Length: 15em] [iOS only]">
         Suggestions
@@ skipping 30 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>