Bump the min-supported OS version in the installer.

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 253 matching lines @@
             << " found " << 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.
+  // We do not support anything prior to Windows 7.
   VLOG(1) << base::SysInfo::OperatingSystemName() << ' '
           << base::SysInfo::OperatingSystemVersion();
-  base::win::Version version = base::win::GetVersion();
-  return (version > base::win::VERSION_XP) ||
-      ((version == base::win::VERSION_XP) &&
-       (base::win::OSInfo::GetInstance()->service_pack().major >= 2));
+  return base::win::GetVersion() >= base::win::VERSION_WIN7;
 }
 
 void InstallUtil::AddInstallerResultItems(
     bool system_install,
     const base::string16& state_key,
     installer::InstallStatus status,
     int string_resource_id,
     const base::string16* const launch_cmd,
     WorkItemList* install_list) {
   DCHECK(install_list);
@@ skipping 381 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);
 }