[Signin iOS] Update title in merging data dialog

ios/chrome/app/strings/ios_chromium_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 192 matching lines @@
       </message>
       <message name="IDS_IOS_OPEN_TABS_SYNC_IS_OFF_MOBILE" desc="Short paragraph(s) encouraging the user to enable sync on device [Length: 300em, may be line wrapped to multiple lines at run time.]">
         Tabs that you've opened in Chromium on your other devices will appear here.
       </message>
       <message name="IDS_IOS_OPTIONS_ACCOUNTS_SIGNOUT" desc="Title of the button to sign out of Chromium [iOS only] [60em]">
         Sign out of Chromium
       </message>
       <message name="IDS_IOS_OPTIONS_ENABLE_PHYSICAL_WEB_DETAILS" desc="The detailed description of an option to enable scanning for nearby devices broadcasting URLs.">
         Discover web pages sent by nearby objects. When Bluetooth is turned on, Chromium can gather web pages associated with objects around you and send them anonymously to Google to find the most useful ones. <ph name="BEGIN_LINK">BEGIN_LINK</ph>Learn more<ph name="END_LINK">END_LINK</ph>
       </message>
+      <message name="IDS_IOS_OPTIONS_IMPORT_DATA_TITLE_SIGNIN" desc="The title of the Import Data settings screen when signing in. [30em]">
+        Sign in to Chromium
+      </message>
       <message name="IDS_IOS_OPTIONS_PRIVACY_FOOTER" desc="Footer for the clear browsing data dialog [Length: 300em] [iOS only]">
         Chromium may use web services to improve your browsing experience. You may optionally disable these services. <ph name="BEGIN_LINK">BEGIN_LINK</ph>Learn more<ph name="END_LINK">END_LINK</ph>
       </message>
       <message name="IDS_IOS_PAGE_INFO_SECURITY_TAB_SECURE_IDENTITY" desc="The text of the identity section for iOS.">
         Chromium verified that <ph name="ISSUER">$1<ex>VeriSign</ex></ph> issued this website's certificate.
       </message>
       <message name="IDS_IOS_PASSWORD_MANAGER_SAVE_PASSWORD_PROMPT" desc="Info bar message to save a password. [Length: 60em]">
         Do you want Chromium to save your password for this site?
       </message>
       <message name="IDS_IOS_PRODUCT_NAME" desc="The Chrome application name">
@@ skipping 58 matching lines @@
       </message>
       <message name="IDS_IOS_TRANSLATE_SETTING_DESCRIPTION" desc="Description for the Translate setting. [Length: unlimited] [iOS only]">
         When this feature is turned on, Chromium will offer to translate pages written in other languages using Google Translate. <ph name="BEGIN_LINK">BEGIN_LINK</ph>Learn more<ph name="END_LINK">END_LINK</ph>
       </message>
       <message name="IDS_IOS_UPGRADE_AVAILABLE" desc="Text to inform the user of the presence of a new version of the application">
         Chromium just got better! A new version is available.
       </message>
     </messages>
   </release>
 </grit>