Fix punctuation of several Page Info strings

chrome/app/google_chrome_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This file contains definitions of strings that are specific to
 Google Chrome. These strings will be translated for each locale that Google
 Chrome supports. If you update this file, be sure also to update
 chromium_strings.grd. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       output_all_resource_defines="false" source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/google_chrome_strings.h" type="rc_header">
@@ skipping 973 matching lines @@
       </message>
       <message name="IDS_EXTENSIONS_SETTINGS_API_SECOND_LINE_START_AND_HOME" desc="Second line in the Settings API bubble. Only shown if the secondary change by the extension was both the start page and the home page. See IDS_EXTENSIONS_SETTINGS_API_SECOND_LINE_START_PAGES for reason for triple quotes.">
         ''' It also controls what page is shown when you start Chrome or click the Home button. '''
       </message>
       <message name="IDS_EXTENSIONS_SETTINGS_API_SECOND_LINE_START_AND_SEARCH" desc="Second line in the Settings API bubble. Only shown if the secondary change by the extension was both the start page and the search engine. See IDS_EXTENSIONS_SETTINGS_API_SECOND_LINE_START_PAGES for reason for triple quotes.">
         ''' It also controls what page is shown when you start Chrome or search from the Omnibox. '''
       </message>
 
       <!-- Website Settings bubble -->
       <message name="IDS_WEBSITE_SETTINGS_INTERNAL_PAGE" desc="Text that is displayed in the header of the Website Settings popup if the page was generated by Chrome itself.">
-        You are viewing a secure Google Chrome page.
+        You're viewing a secure Google Chrome page
       </message>
 
       <!-- Webstore strings -->
       <message name="IDS_WEBSTORE_APP_DESCRIPTION" desc="Description for the WebStore app.">
         Discover great apps, games, extensions and themes for Google Chrome.
       </message>
 
       <!-- Windows firewall rule strings. -->
       <if expr="is_win">
         <message name="IDS_INBOUND_MDNS_RULE_NAME" desc="The name of the firewall rule allowing inbound mDNS traffic.">
@@ skipping 239 matching lines @@
         <message name="IDS_WIN10_WELCOME_PIN_SUBHEADING" desc="A subheading on a section which gives instructions on how to pin Chrome to the Windows 10 taskbar.">
           Pin Chrome to your taskbar
         </message>
         <message name="IDS_WIN10_WELCOME_SELECT" desc="An instruction asking the user to select Chrome from an external list of apps.">
           Select <ph name="SMALL_PRODUCT_LOGO">&lt;div class="logo-small"&gt;&lt;/div&gt;</ph> <ph name="BEGIN_BOLD">&lt;strong&gt;</ph>Google Chrome<ph name="END_BOLD">&lt;/strong&gt;</ph>
         </message>
       </if>
     </messages>
   </release>
 </grit>