Fixed all unused-variable Clang warnings on Windows.

chrome/installer/test/alternate_version_generator.cc

 // Copyright (c) 2011 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.
 
 // The file contains the implementation of the mini_installer re-versioner.
 // The main function (GenerateNextVersion) does the following in a temp dir:
 // - Extracts and unpacks setup.exe and the Chrome-bin folder from
 //   mini_installer.exe.
 // - Inspects setup.exe to determine the current version.
 // - Runs through all .dll and .exe files:
@@ skipping 39 matching lines @@
 #include "chrome/installer/test/resource_loader.h"
 #include "chrome/installer/test/resource_updater.h"
 #include "chrome/installer/util/lzma_util.h"
 
 namespace {
 
 const wchar_t k7zaExe[] = L"7za.exe";
 const wchar_t k7zaPathRelative[] = L"..\\..\\third_party\\lzma_sdk\\Executable";
 const wchar_t kB7[] = L"B7";
 const wchar_t kBl[] = L"BL";
-const wchar_t kChrome7z[] = L"chrome.7z";
 const wchar_t kChromeBin[] = L"Chrome-bin";
 const wchar_t kChromePacked7z[] = L"chrome.packed.7z";
 const wchar_t kExe[] = L"exe";
 const wchar_t kExpandExe[] = L"expand.exe";
 const wchar_t kExtDll[] = L".dll";
 const wchar_t kExtExe[] = L".exe";
 const wchar_t kMakeCab[] = L"makecab.exe";
 const wchar_t kSetupEx_[] = L"setup.ex_";
 const wchar_t kSetupExe[] = L"setup.exe";
 const char kSwitch7zaPath[] = "7za_path";
@@ skipping 622 matching lines @@
     return false;
   }
   ctx.current_version_str = ctx.current_version.ToString();
   ctx.new_version = ChromeVersion::FromString(version.GetString());
   ctx.new_version_str = ctx.new_version.ToString();
 
   return UpdateVersionIfMatch(target_file, &ctx);
 }
 
 }  // namespace upgrade_test