Revert of base: Remove using:: declaration from version.h header.

chrome/installer/util/install_util.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.
 //
 // See the corresponding header file for description of the functions in this
 // file.
 
 #include "chrome/installer/util/install_util.h"
 
 #include <shellapi.h>
@@ skipping 212 matching lines @@
     BrowserDistribution::Type distribution_type) {
   ProductState state;
   if (state.Initialize(system_install, distribution_type)) {
     return state.uninstall_command();
   }
   return base::CommandLine(base::CommandLine::NO_PROGRAM);
 }
 
 void InstallUtil::GetChromeVersion(BrowserDistribution* dist,
                                    bool system_install,
-                                   base::Version* version) {
+                                   Version* version) {
   DCHECK(dist);
   RegKey key;
   HKEY reg_root = (system_install) ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
   LONG result = key.Open(reg_root,
                          dist->GetVersionKey().c_str(),
                          KEY_QUERY_VALUE | KEY_WOW64_32KEY);
 
   base::string16 version_str;
   if (result == ERROR_SUCCESS)
     result = key.ReadValue(google_update::kRegVersionField, &version_str);
 
-  *version = base::Version();
+  *version = Version();
   if (result == ERROR_SUCCESS && !version_str.empty()) {
     VLOG(1) << "Existing " << dist->GetDisplayName() << " version found "
             << version_str;
-    *version = base::Version(base::UTF16ToASCII(version_str));
+    *version = Version(base::UTF16ToASCII(version_str));
   } else {
     DCHECK_EQ(ERROR_FILE_NOT_FOUND, result);
     VLOG(1) << "No existing " << dist->GetDisplayName()
             << " install found.";
   }
 }
 
 void InstallUtil::GetCriticalUpdateVersion(BrowserDistribution* dist,
                                            bool system_install,
-                                           base::Version* version) {
+                                           Version* version) {
   DCHECK(dist);
   RegKey key;
   HKEY reg_root = (system_install) ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
   LONG result = key.Open(reg_root,
                          dist->GetVersionKey().c_str(),
                          KEY_QUERY_VALUE | KEY_WOW64_32KEY);
 
   base::string16 version_str;
   if (result == ERROR_SUCCESS)
     result = key.ReadValue(google_update::kRegCriticalVersionField,
                            &version_str);
 
-  *version = base::Version();
+  *version = Version();
   if (result == ERROR_SUCCESS && !version_str.empty()) {
     VLOG(1) << "Critical Update version for " << dist->GetDisplayName()
             << " found " << version_str;
-    *version = base::Version(base::UTF16ToASCII(version_str));
+    *version = Version(base::UTF16ToASCII(version_str));
   } else {
     DCHECK_EQ(ERROR_FILE_NOT_FOUND, result);
     VLOG(1) << "No existing " << dist->GetDisplayName()
             << " install found.";
   }
 }
 
 bool InstallUtil::IsOSSupported() {
   // We do not support Win2K or older, or XP without service pack 2.
   VLOG(1) << base::SysInfo::OperatingSystemName() << ' '
@@ skipping 396 matching lines @@
   // Open the program and see if it references the expected file.
   base::File file;
   BY_HANDLE_FILE_INFORMATION info = {};
 
   return (OpenForInfo(path, &file) &&
           GetInfo(file, &info) &&
           info.dwVolumeSerialNumber == file_info_.dwVolumeSerialNumber &&
           info.nFileIndexHigh == file_info_.nFileIndexHigh &&
           info.nFileIndexLow == file_info_.nFileIndexLow);
 }