Flip 32-bit warning string to let users know it’s the end of the line

chrome/browser/mac/obsolete_system.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_MAC_OBSOLETE_SYSTEM_H_
 #define CHROME_BROWSER_MAC_OBSOLETE_SYSTEM_H_
 
 #include "base/basictypes.h"
 #include "base/strings/string16.h"
 
@@ skipping 27 matching lines @@
 #if !defined(ARCH_CPU_64_BITS)
   static base::string16 LocalizedObsoleteSystemString();
 #else
   static base::string16 LocalizedObsoleteSystemString() {
     return base::string16();
   }
 #endif
 
   // true if this is the final release that will run on 32-bit-only systems.
   static bool Is32BitEndOfTheLine() {
-    // TODO(mark): Change to true immediately prior to the final build that
-    // supports 32-bit-only systems.
-    return false;
+    return true;
   }
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ObsoleteSystemMac);
 };
 
 #endif  // CHROME_BROWSER_MAC_OBSOLETE_SYSTEM_H_