Move GetFreeDiskSpace to SysInfo.

base/sys_info_unittest.cc

Index: base/sys_info_unittest.cc
===================================================================
--- base/sys_info_unittest.cc	(revision 2357)
+++ base/sys_info_unittest.cc	(working copy)
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/file_util.h"
 #include "base/sys_info.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -13,4 +14,12 @@
 TEST(SysInfoTest, AmountOfMem) {
   // We aren't actually testing that it's correct, just that it's sane.
   EXPECT_GT(base::SysInfo::AmountOfPhysicalMemory(), 0);
+  EXPECT_GT(base::SysInfo::AmountOfPhysicalMemoryMB(), 0);
 }
+
+TEST(SysInfoTest, AmountOfFreeDiskSpace) {
+  // We aren't actually testing that it's correct, just that it's sane.
+  std::wstring tmp_path;
+  ASSERT_TRUE(file_util::GetTempDir(&tmp_path));
+  EXPECT_GT(base::SysInfo::AmountOfFreeDiskSpace(tmp_path), 0);
+}