Bump the min-supported OS version in the installer.

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"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/google_chrome_strings.h" type="rc_header">
@@ skipping 403 matching lines @@
         <message name="IDS_INSTALL_FAILED" desc="Error displayed if installation fails due to some unknown error.">
           Installation failed due to unspecified error. If Google Chrome is currently running, please close it and try again.
         </message>
         <message name="IDS_SAME_VERSION_REPAIR_FAILED" desc="Error displayed if installation fails due to Chrome running.">
           Can not install the same Google Chrome version that is currently running. Please close Google Chrome and try again.
         </message>
         <message name="IDS_SETUP_PATCH_FAILED" desc="Error message when setup.exe fails to patch itself.">
           Installation failed due to unspecified error. Please download Google Chrome again.
         </message>
         <message name="IDS_INSTALL_OS_NOT_SUPPORTED" desc="Error displayed if OS is not supported">
-          Google Chrome requires Windows Vista or Windows XP with SP2 or higher.
+          Google Chrome requires Windows 7 or higher.
         </message>
         <message name="IDS_INSTALL_OS_ERROR" desc="Error displayed when any Windows API call fails and we do not have more specific information.">
           An operating system error occurred during installation. Please download Google Chrome again.
         </message>
         <message name="IDS_INSTALL_TEMP_DIR_FAILED" desc="Error displayed when we fail to create temporary directory during installation.">
           The installer couldn't create a temporary directory. Please check for free disk space and permission to install software.
         </message>
         <message name="IDS_INSTALL_UNCOMPRESSION_FAILED" desc="Error when when we can not uncompress installation archive.">
           The installer failed to uncompress archive. Please download Google Chrome again.
         </message>
@@ skipping 737 matching lines @@
         </message>
         <message name="IDS_METRO_FLOW_LOGO_STRING_ALT"
                  desc="Alt text for the faded Chrome logo image.">
           Chrome logo
         </message>
       </if>
 
     </messages>
   </release>
 </grit>