Implement SysInfo::HardwareModelName() on iOS.

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 51 matching lines @@
 
   // Return the total disk space in bytes on the volume containing |path|, or -1
   // on failure.
   static int64_t AmountOfTotalDiskSpace(const FilePath& path);
 
   // 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.
+  // e.g. "MacPro1,1" on Mac, "iPhone9,3" on iOS or "Nexus 5" on Android. Only
+  // implemented on OS X, iOS, 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();
 
   // Returns the version of the host operating system.
   static std::string OperatingSystemVersion();
 
   // Retrieves detailed numeric values for the OS version.
   // DON'T USE THIS ON THE MAC OR WINDOWS to determine the current OS release
@@ skipping 78 matching lines @@
 
 #if defined(OS_LINUX) || defined(OS_ANDROID) || defined(OS_AIX)
   static int64_t AmountOfAvailablePhysicalMemory(
       const SystemMemoryInfoKB& meminfo);
 #endif
 };
 
 }  // namespace base
 
 #endif  // BASE_SYS_INFO_H_