More -Wunused-private-field cleanups.

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 <sys/stat.h>
 #include <sys/types.h>
 #include <sys/utsname.h>
@@ skipping 141 matching lines @@
     // files are created with group of parent dir (good), owner of euid (good).
     chmod([system_path fileSystemRepresentation], Permissions() & ~0111);
     return system_path;
   }
 
   // Failed, try user.
   // -stringByExpandingTildeInPath returns root's home directory if this is run
   // setuid root, and in that case the kSystemBrandPath path above should have
   // worked anyway. So only try user if geteuid() isn't root.
   if (geteuid() != 0) {
-    NSString* user_path = [user_path stringByExpandingTildeInPath];
+    user_path = [user_path stringByExpandingTildeInPath];
     if (CreatePathToFile(user_path) &&
         [data writeToFile:user_path atomically:YES]) {
       chmod([user_path fileSystemRepresentation], Permissions() & ~0111);
       return user_path;
     }
   }
   return nil;
 }
 
 NSString* WriteBrandCode(const char* brand_code) {
@@ skipping 191 matching lines @@
     // root.
   }
   return 1;
 }
 
 int LaunchGoogleChrome() {
   @autoreleasepool {
     return [[NSWorkspace sharedWorkspace] launchApplication:kChromeInstallPath];
   }
 }