Remove unused string and fix punctuation in IDS_PAGE_INFO_INTERNAL_PAGE

components/components_chromium_strings.grd

 <?xml version="1.0" encoding="utf-8"?>
 
 <grit latest_public_release="0" current_release="1"
       output_all_resource_defines="false" source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/components_chromium_strings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="components_chromium_strings_am.pak" type="data_package" lang="am" />
     <output filename="components_chromium_strings_ar.pak" type="data_package" lang="ar" />
@@ skipping 192 matching lines @@
         Crash reporting is not available in Chromium.
       </message>
 
       <!-- Version UI -->
       <message name="IDS_VERSION_UI_LICENSE" desc="The label below the copyright message, containing the URLs.">
         Chromium is made possible by the <ph name="BEGIN_LINK_CHROMIUM">&lt;a target="_blank" href="$1"&gt;</ph>Chromium<ph name="END_LINK_CHROMIUM">&lt;/a&gt;</ph> open source project and other <ph name="BEGIN_LINK_OSS">&lt;a target="_blank" href="$2"&gt;</ph>open source software<ph name="END_LINK_OSS">&lt;/a&gt;</ph>.
       </message>
 
       <!-- Page Info bubble -->
       <message name="IDS_PAGE_INFO_INTERNAL_PAGE" desc="Message to display in the page info bubble when the page you are on is a chrome:// page or about:something.">
-        You are viewing a secure Chromium page.
+        You're viewing a secure Chromium page
       </message>
 
       <message name="IDS_SESSION_CRASHED_VIEW_MESSAGE" desc="Message shown when the last session didn't exit cleanly.">
         Chromium didn't shut down correctly.
       </message>
 
       <!-- Strings describing Chromium security policy for DevTools security panel -->
       <message name="IDS_PRIVATE_USER_DATA_INPUT_FUTURE_DESCRIPTION" desc="Description of a security problem where the site collects private user data on an insecure page, which will result in an omnibox warning in future versions of Chromium." translateable="false">
         This page includes a password or credit card input over HTTP. A warning will be added to the URL bar starting in Chromium 56 (Jan 2017).
       </message>
       <message name="IDS_PRIVATE_USER_DATA_INPUT_DESCRIPTION" desc="Description of a security problem where the site collects private user data on an insecure page, which results in an omnibox warning." translateable="false">
         This page includes a password or credit card input over HTTP. A warning has been added to the URL bar.
       </message>
     </messages>
   </release>
 </grit>