Fixed all unused-variable Clang warnings on Windows.

chrome/browser/install_verification/win/imported_module_verification.cc

 // Copyright 2013 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/browser/install_verification/win/imported_module_verification.h"
 
 #include <Windows.h>
 
 #include <algorithm>
 #include <iterator>
 #include <string>
 #include <vector>
 #include "base/logging.h"
 #include "base/strings/string16.h"
 #include "chrome/browser/install_verification/win/module_info.h"
 
 namespace {
 
+#if !defined(_WIN64)
 // We must make sure not to include modules here that are likely to get unloaded
 // because the scanning of the module is not done within a loader lock, so is
 // not resilient to changes made to the modules list.
 const wchar_t* const kModulesToScan[] = {
   L"chrome.dll",
   L"kernel32.dll",
   L"user32.dll"
 };
+#endif  // !defined(_WIN64)
 
 bool AddressBeyondRange(const ModuleInfo& module, uintptr_t address) {
   return module.base_address + module.size < address;
 }
 
 void ScanImportAddressTable(
     HMODULE module_handle,
     const std::set<ModuleInfo>& loaded_modules,
     std::set<base::string16>* imported_modules) {
   DCHECK(module_handle);
@@ skipping 54 matching lines @@
   }
 
   std::vector<std::string> module_name_digests;
   std::transform(imported_module_names.begin(),
                  imported_module_names.end(),
                  std::back_inserter(module_name_digests),
                  &CalculateModuleNameDigest);
   ReportModuleMatches(module_name_digests, module_ids, delegate);
 #endif
 }