Add WOW64 support to the installer registry work items

chrome/installer/util/delete_reg_value_work_item.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/util/delete_reg_value_work_item.h"
 
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/win/registry.h"
 #include "chrome/installer/util/logging_installer.h"
 
 using base::win::RegKey;
 
 DeleteRegValueWorkItem::DeleteRegValueWorkItem(HKEY predefined_root,
                                                const std::wstring& key_path,
+                                               REGSAM wow64_access,
                                                const std::wstring& value_name)
     : predefined_root_(predefined_root),
       key_path_(key_path),
       value_name_(value_name),
+      wow64_access_(wow64_access),
       previous_type_(0),
       status_(DELETE_VALUE) {
+  DCHECK(wow64_access == 0 ||
+         wow64_access == KEY_WOW64_32KEY ||
+         wow64_access == KEY_WOW64_64KEY);
 }
 
 DeleteRegValueWorkItem::~DeleteRegValueWorkItem() {
 }
 
 bool DeleteRegValueWorkItem::Do() {
   if (status_ != DELETE_VALUE) {
     // we already did something.
     LOG(ERROR) << "multiple calls to Do()";
     return false;
   }
 
   status_ = VALUE_UNCHANGED;
 
   RegKey key;
   DWORD type = 0;
   DWORD size = 0;
-  LONG result = key.Open(predefined_root_, key_path_.c_str(),
-                         KEY_READ | KEY_WRITE);
+  LONG result = key.Open(predefined_root_,
+                         key_path_.c_str(),
+                         KEY_READ | KEY_WRITE | wow64_access_);
   if (result == ERROR_SUCCESS)
     result = key.ReadValue(value_name_.c_str(), NULL, &size, &type);
 
   if (result == ERROR_FILE_NOT_FOUND) {
     LOG(INFO) << "(delete value) Key: " << key_path_ << " or Value: "
               << value_name_ << " does not exist.";
     status_ = VALUE_NOT_FOUND;
     return true;
   }
 
@@ skipping 25 matching lines @@
   if (status_ == DELETE_VALUE || status_ == VALUE_ROLLED_BACK)
     return;
   if (status_ == VALUE_UNCHANGED || status_ == VALUE_NOT_FOUND) {
     status_ = VALUE_ROLLED_BACK;
     VLOG(1) << "rollback: setting unchanged, nothing to do";
     return;
   }
 
   // At this point only possible state is VALUE_DELETED.
   RegKey key;
-  LONG result = key.Open(predefined_root_, key_path_.c_str(),
-                         KEY_READ | KEY_WRITE);
+  LONG result = key.Open(predefined_root_,
+                         key_path_.c_str(),
+                         KEY_READ | KEY_WRITE | wow64_access_);
   if (result == ERROR_SUCCESS) {
     // try to restore the previous value
     DWORD previous_size = static_cast<DWORD>(previous_value_.size());
     const char* previous_value =
         previous_size ? &previous_value_[0] : NULL;
     result = key.WriteValue(value_name_.c_str(), previous_value,
                             previous_size, previous_type_);
     VLOG_IF(1, result != ERROR_SUCCESS) << "rollback: restoring "
                                         << value_name_ << " error: " << result;
   } else {
     VLOG(1) << "can not open " << key_path_ << " error: " << result;
   }
 }