Fix free memory calculation.

base/process/process_metrics_win.cc

 // Copyright (c) 2013 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/process/process_metrics.h"
 
 #include <windows.h>
 #include <psapi.h>
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 13 matching lines @@
 const int PAGESIZE_KB = 4;
 
 typedef NTSTATUS(WINAPI* NTQUERYSYSTEMINFORMATION)(
     SYSTEM_INFORMATION_CLASS SystemInformationClass,
     PVOID SystemInformation,
     ULONG SystemInformationLength,
     PULONG ReturnLength);
 
 }  // namespace
 
-SystemMemoryInfoKB::SystemMemoryInfoKB()
-    : total(0), free(0), swap_total(0), swap_free(0) {}
-
-SystemMemoryInfoKB::SystemMemoryInfoKB(const SystemMemoryInfoKB& other) =
-    default;
-
 ProcessMetrics::~ProcessMetrics() { }
 
 // static
 std::unique_ptr<ProcessMetrics> ProcessMetrics::CreateProcessMetrics(
     ProcessHandle process) {
   return WrapUnique(new ProcessMetrics(process));
 }
 
 size_t ProcessMetrics::GetPagefileUsage() const {
   PROCESS_MEMORY_COUNTERS pmc;
@@ skipping 292 matching lines @@
   return (info.CommitTotal * system_info.dwPageSize) / 1024;
 }
 
 size_t GetPageSize() {
   return PAGESIZE_KB * 1024;
 }
 
 // This function uses the following mapping between MEMORYSTATUSEX and
 // SystemMemoryInfoKB:
 //   ullTotalPhys ==> total
-//   ullAvailPhys ==> free
+//   ullAvailPhys ==> avail_phys
 //   ullTotalPageFile ==> swap_total
 //   ullAvailPageFile ==> swap_free
 bool GetSystemMemoryInfo(SystemMemoryInfoKB* meminfo) {
   MEMORYSTATUSEX mem_status;
   mem_status.dwLength = sizeof(mem_status);
   if (!::GlobalMemoryStatusEx(&mem_status))
     return false;
 
   meminfo->total = mem_status.ullTotalPhys / 1024;
-  meminfo->free = mem_status.ullAvailPhys / 1024;
+  meminfo->avail_phys = mem_status.ullAvailPhys / 1024;
   meminfo->swap_total = mem_status.ullTotalPageFile / 1024;
   meminfo->swap_free = mem_status.ullAvailPageFile / 1024;
 
   return true;
 }
 
 }  // namespace base