Clean up a few unused globals.

chrome/installer/gcapi_mac/gcapi.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.
 
 #include "chrome/installer/gcapi_mac/gcapi.h"
 
 #import <Cocoa/Cocoa.h>
 #include <grp.h>
 #include <pwd.h>
 #include <sys/stat.h>
@@ skipping 16 matching lines @@
 NSString* const kUserKsadminPath =
     @"~~/Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/"
      "Contents/MacOS/ksadmin";
 
 NSString* const kSystemMasterPrefsPath =
     @"/Library/Google/Google Chrome Master Preferences";
 NSString* const kUserMasterPrefsPath =
     @"~~/Library/Application Support/Google/Chrome/"
      "Google Chrome Master Preferences";
 
-NSString* const kChannelKey = @"KSChannelID";
-NSString* const kVersionKey = @"KSVersion";
-
 // Condensed from chromium's base/mac/mac_util.mm.
 bool IsOSXVersionSupported() {
   // On 10.6, Gestalt() was observed to be able to spawn threads (see
   // http://crbug.com/53200). Don't call Gestalt().
   struct utsname uname_info;
   if (uname(&uname_info) != 0)
     return false;
   if (strcmp(uname_info.sysname, "Darwin") != 0)
     return false;
 
@@ skipping 405 matching lines @@
     else if (FindChromeTicket(kSystemTicket, NULL, &path) && path)
       app_path = path;
     else
       app_path = kChromeInstallPath;
 
     // NSWorkspace launches processes as the current console owner,
     // even when running with euid of 0.
     return [[NSWorkspace sharedWorkspace] launchApplication:app_path];
   }
 }