Fixed all unused-variable Clang warnings on Windows.

chrome/installer/setup/install_worker_unittest.cc

 // 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/setup/install_worker.h"
 
 #include "base/win/registry.h"
 #include "base/version.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/installer/setup/setup_util.h"
@@ skipping 455 matching lines @@
                       archive_path_,
                       src_path_,
                       temp_dir_,
                       current_version_.get(),
                       *new_version_.get(),
                       &work_item_list);
 }
 
 namespace {
 
-const wchar_t elevation_key[] =
-    L"SOFTWARE\\Microsoft\\Internet Explorer\\Low Rights\\ElevationPolicy\\"
-    L"{E0A900DF-9611-4446-86BD-4B1D47E7DB2A}";
 const wchar_t old_elevation_key[] =
     L"SOFTWARE\\Microsoft\\Internet Explorer\\Low Rights\\ElevationPolicy\\"
     L"{6C288DD7-76FB-4721-B628-56FAC252E199}";
 
 }  // namespace
 
 // A test class for worker functions that manipulate the old IE low rights
 // policies.
 // Parameters:
 // bool : system_level_
@@ skipping 308 matching lines @@
               prod_type_list[i_type_check]);
           bool prod_expect = (mach_after & (1 << i_type_check)) != 0;
           EXPECT_EQ(prod_expect, prod_res);
         }
       }
     }
   }
 }
 
 #endif  // defined(GOOGLE_CHROME_BUILD)