Fix free memory calculation.

base/sys_info_win.cc

Index: base/sys_info_win.cc
diff --git a/base/sys_info_win.cc b/base/sys_info_win.cc
index cb184bae2589d607919858bacc4a1969353c5e98..d1c485c129e8bc117760baa6f9dc6b55cd8b85a3 100644
--- a/base/sys_info_win.cc
+++ b/base/sys_info_win.cc
@@ -12,6 +12,7 @@
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
+#include "base/process/process_metrics.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/win/windows_version.h"
@@ -68,7 +69,10 @@ int64_t SysInfo::AmountOfPhysicalMemory() {
 
 // static
 int64_t SysInfo::AmountOfAvailablePhysicalMemory() {
-  return AmountOfMemory(&MEMORYSTATUSEX::ullAvailPhys);
+  SystemMemoryInfoKB info;
+  if (!GetSystemMemoryInfo(&info))
+    return 0;
+  return static_cast<int64_t>(info.avail_phys) * 1024;
 }
 
 // static