Make the new Mojo EDK work on XP.

base/sys_info_win.cc

 // Copyright 2015 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 "base/sys_info.h"
 
 #include <windows.h>
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
@@ skipping 30 matching lines @@
   return AmountOfMemory(&MEMORYSTATUSEX::ullTotalPhys);
 }
 
 // static
 int64 SysInfo::AmountOfAvailablePhysicalMemory() {
   return AmountOfMemory(&MEMORYSTATUSEX::ullAvailPhys);
 }
 
 // static
 int64 SysInfo::AmountOfVirtualMemory() {
-  return 0;
+  return AmountOfMemory(&MEMORYSTATUSEX::ullTotalVirtual);
 }
 
 // static
 int64 SysInfo::AmountOfFreeDiskSpace(const FilePath& path) {
   ThreadRestrictions::AssertIOAllowed();
 
   ULARGE_INTEGER available, total, free;
   if (!GetDiskFreeSpaceExW(path.value().c_str(), &available, &total, &free))
     return -1;
 
@@ skipping 54 matching lines @@
 void SysInfo::OperatingSystemVersionNumbers(int32* major_version,
                                             int32* minor_version,
                                             int32* bugfix_version) {
   win::OSInfo* os_info = win::OSInfo::GetInstance();
   *major_version = os_info->version_number().major;
   *minor_version = os_info->version_number().minor;
   *bugfix_version = 0;
 }
 
 }  // namespace base