base: SysInfo::Uptime() returns a TimeDelta

base/sys_info.h

 // 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.
 
 #ifndef BASE_SYS_INFO_H_
 #define BASE_SYS_INFO_H_
 
 #include <map>
 #include <string>
 
@@ skipping 30 matching lines @@
   // Return the number of megabytes of available virtual memory, or zero if it
   // is unlimited.
   static int AmountOfVirtualMemoryMB() {
     return static_cast<int>(AmountOfVirtualMemory() / 1024 / 1024);
   }
 
   // Return the available disk space in bytes on the volume containing |path|,
   // or -1 on failure.
   static int64 AmountOfFreeDiskSpace(const FilePath& path);
 
-  // Returns system uptime in milliseconds.
-  static int64 Uptime();
+  // Returns system uptime.
+  static TimeDelta Uptime();
 
   // Returns a descriptive string for the current machine model or an empty
   // string if the machine model is unknown or an error occured.
   // e.g. "MacPro1,1" on Mac, or "Nexus 5" on Android. Only implemented on OS X,
   // Android, and Chrome OS. This returns an empty string on other platforms.
   static std::string HardwareModelName();
 
   // Returns the name of the host operating system.
   static std::string OperatingSystemName();
 
@@ skipping 72 matching lines @@
 
   // Returns true if this is a low-end device.
   // Low-end device refers to devices having less than 512M memory in the
   // current implementation.
   static bool IsLowEndDevice();
 };
 
 }  // namespace base
 
 #endif  // BASE_SYS_INFO_H_