Create a "GetWOW64Status()" utility function and make the rest of the codebas...

chrome/installer/setup/install_worker.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.
 //
 // This file contains the definitions of the installer functions that build
 // the WorkItemList used to install the application.
 
 #include "chrome/installer/setup/install_worker.h"
 
 #include <shlobj.h>
 #include <time.h>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "base/version.h"
 #include "base/win/registry.h"
+#include "base/win/windows_version.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/installer/setup/install.h"
 #include "chrome/installer/setup/setup_constants.h"
 #include "chrome/installer/util/conditional_work_item_list.h"
 #include "chrome/installer/util/create_reg_key_work_item.h"
 #include "chrome/installer/util/google_update_constants.h"
 #include "chrome/installer/util/helper.h"
 #include "chrome/installer/util/installation_state.h"
 #include "chrome/installer/util/installer_state.h"
 #include "chrome/installer/util/install_util.h"
 #include "chrome/installer/util/product.h"
 #include "chrome/installer/util/set_reg_value_work_item.h"
 #include "chrome/installer/util/shell_util.h"
 #include "chrome/installer/util/util_constants.h"
 #include "chrome/installer/util/work_item_list.h"
 
 #include "chrome_tab.h"  // NOLINT
 
 using base::win::RegKey;
 
-namespace {
-
-// This method tells if we are running on 64 bit platform so that we can copy
-// one extra exe. If the API call to determine 64 bit fails, we play it safe
-// and return true anyway so that the executable can be copied.
-bool Is64bit() {
-  typedef BOOL (WINAPI* WOW_FUNC)(HANDLE, BOOL*);
-  BOOL is_64 = FALSE;
-
-  HMODULE module = GetModuleHandle(L"kernel32.dll");
-  WOW_FUNC is_wow64 = reinterpret_cast<WOW_FUNC>(
-      GetProcAddress(module, "IsWow64Process"));
-  return (is_wow64 != NULL) &&
-           (!(is_wow64)(GetCurrentProcess(), &is_64) || (is_64 != FALSE));
-}
-
-}  // namespace
-
 namespace installer {
 
 // Local helper to call AddRegisterComDllWorkItems for all DLLs in a set of
 // products managed by a given package.
 void AddRegisterComDllWorkItemsForPackage(const InstallerState& installer_state,
                                           const Version* old_version,
                                           const Version& new_version,
                                           WorkItemList* work_item_list) {
   // First collect the list of DLLs to be registered from each product.
   std::vector<FilePath> com_dll_list;
@@ skipping 479 matching lines @@
   FilePath new_chrome_exe(
       target_path.Append(installer::kChromeNewExe));
 
   install_list->AddDeleteTreeWorkItem(new_chrome_exe, temp_path);
   install_list->AddCopyTreeWorkItem(
       src_path.Append(installer::kChromeExe).value(),
       target_path.Append(installer::kChromeExe).value(),
       temp_path.value(), WorkItem::NEW_NAME_IF_IN_USE, new_chrome_exe.value());
 
   // Extra executable for 64 bit systems.
-  if (Is64bit()) {
+  // NOTE: We check for "not disabled" so that if the API call fails, we play it
+  // safe and copy the executable anyway.
+  if (base::win::GetWOW64Status() != base::win::WOW64_DISABLED) {
     install_list->AddMoveTreeWorkItem(
         src_path.Append(installer::kWowHelperExe).value(),
         target_path.Append(installer::kWowHelperExe).value(),
         temp_path.value());
   }
 
   // In the past, we copied rather than moved for system level installs so that
   // the permissions of %ProgramFiles% would be picked up.  Now that |temp_path|
   // is in %ProgramFiles% for system level installs (and in %LOCALAPPDATA%
   // otherwise), there is no need to do this.
@@ skipping 463 matching lines @@
     } else {
       DCHECK(operation == REMOVE_COMMAND);
       work_item_list->AddDeleteRegKeyWorkItem(installer_state.root_key(),
                                               cmd_key)->set_log_message(
           "removing quick-enable-cf command");
     }
   }
 }
 
 }  // namespace installer