mac: Remove vestiges of 32-bit deprecation

chrome/browser/mac/keystone_glue.mm

 // Copyright (c) 2012 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.
 
 #import "chrome/browser/mac/keystone_glue.h"
 
 #include <sys/mount.h>
 #include <sys/param.h>
 #include <sys/stat.h>
 
@@ skipping 179 matching lines @@
 - (void)changePermissionsForPromotionComplete;
 
 // Returns the brand file path to use for Keystone.
 - (NSString*)brandFilePath;
 
 // YES if no update installation has succeeded since a binary diff patch
 // installation failed. This signals the need to attempt a full installer
 // which does not depend on applying a patch to existing files.
 - (BOOL)wantsFullInstaller;
 
-// Returns an NSString* suitable for appending to a Chrome Keystone tag value
-// or tag key. If the system has a 32-bit-only CPU, the tag suffix will
-// contain the string "-32bit". If a full installer (as opposed to a binary
-// diff/delta patch) is required, the tag suffix will contain the string
-// "-full". If no special treatment is required, the tag suffix will be an
-// empty string.
+// Returns an NSString* suitable for appending to a Chrome Keystone tag value or
+// tag key.  If a full installer (as opposed to a binary diff/delta patch) is
+// required, the tag suffix will contain the string "-full". If no special
+// treatment is required, the tag suffix will be an empty string.
 - (NSString*)tagSuffix;
 
 @end  // @interface KeystoneGlue (Private)
 
 NSString* const kAutoupdateStatusNotification = @"AutoupdateStatusNotification";
 NSString* const kAutoupdateStatusStatus = @"status";
 NSString* const kAutoupdateStatusVersion = @"version";
 
 namespace {
 
@@ skipping 917 matching lines @@
   return [KeystoneGlue defaultKeystoneGlue] != nil;
 }
 
 base::string16 CurrentlyInstalledVersion() {
   KeystoneGlue* keystoneGlue = [KeystoneGlue defaultKeystoneGlue];
   NSString* version = [keystoneGlue currentlyInstalledVersion];
   return base::SysNSStringToUTF16(version);
 }
 
 }  // namespace keystone_glue