Cleanup: Remove unneeded SSE2 checks and unused code.

chrome/app/chromium_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This file contains definitions of strings that are distribution specific.
 These strings will not be translated and only english versions will
 be available for now. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/chromium_strings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 311 matching lines @@
       </message>
       <if expr="is_macosx">
         <!-- Mac 32-bit deprecation -->
         <message name="IDS_MAC_32_BIT_OBSOLETE_SOON" desc="A message displayed on an at-launch infobar and About (Help) page warning the user that the computer they are using is about to become unsupported.">
           This computer will soon stop receiving Chromium updates because its hardware is no longer supported.
         </message>
         <message name="IDS_MAC_32_BIT_OBSOLETE_NOW" desc="A message displayed on an at-launch infobar and About (Help) page warning the user that the computer they are using is no longer supported.">
           This computer will no longer receive Chromium updates because its hardware is no longer supported.
         </message>
       </if>
-      <if expr="is_win">
-        <!-- Windows non-SSE2 deprecation -->
-        <message name="IDS_WIN_SSE_OBSOLETE_NOW" desc="A message displayed on an at-launch infobar and About (Help) page warning the user that the computer they are using is no longer supported.">
-          This computer will no longer receive Chromium updates because its hardware is no longer supported.
-        </message>
-      </if>
       <message name="IDS_ACCNAME_APP" desc="The accessible name for the app menu.">
         Chromium
       </message>
       <message name="IDS_ACCNAME_TOOLBAR" desc="The accessible name for the application's toolbar.">
         Chromium Toolbar
       </message>
       <!-- Hung Browser Detector -->
       <if expr="is_win">
         <message name="IDS_BROWSER_HUNGBROWSER_MESSAGE" desc="Content of the dialog box shown when the browser is hung">
           Chromium is unresponsive. Relaunch now?
@@ skipping 932 matching lines @@
           Chromium updates automatically so you always have the freshest version. When this download completes, Chromium will restart and you'll be on your way.
         </message>
         <message name="IDS_EULA_SCREEN_ACCESSIBLE_TITLE" desc="Title to be spoken on opening the OOBE EULA screen">
           Chromium OS terms
         </message>
       </if>
 
     </messages>
   </release>
 </grit>