Update OS version checks.

remoting/resources/remoting_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <grit base_dir="." current_release="1" enc_check="möl" latest_public_release="0" source_lang_id="en">
   <outputs>
     <output filename="remoting/base/string_resources.h" type="rc_header">
       <emit emit_type="prepend"/>
     </output>
 
     <output filename="remoting/resources/am.pak" lang="am" type="data_package"/>
     <output filename="remoting/resources/ar.pak" lang="ar" type="data_package"/>
@@ skipping 1147 matching lines @@
       <message desc="Label for the button to accept sharing the computer in 'It2Me' mode." name="IDS_SHARE_CONFIRM_DIALOG_CONFIRM" >
         Share
       </message>
       <message desc="Label for the button to decline sharing the computer in 'It2Me' mode." name="IDS_SHARE_CONFIRM_DIALOG_DECLINE" >
         Cancel
       </message>
       <message desc="Text shown in tooltip to inform the user that a setting is managed by domain policy." name="IDS_SETTING_MANAGED_BY_POLICY">
         This setting is managed by your domain policy.
       </message>
       <message desc="Platform-specific text indicating that a component is for the Windows OS." name="IDS_FOR_PLATFORM_WINDOWS">
-        For Windows (XP and above)
+        For Windows 7 and above
       </message>
       <message desc="Platform-specific text indicating that a component is for the Mac OS." name="IDS_FOR_PLATFORM_MAC">
-        For Mac (OS X 10.6 and above)
+        For Mac (OS X Mavericks 10.9 and above)
       </message>
       <message desc="Text for the button the user clicks to indicate that they agree to the terms of service and want to proceed with downloading the installer." name="IDS_ACCEPT_AND_INSTALL">
         Accept and Install
       </message>
 
     </messages>
   </release>
 </grit>