Cleanup: Rename to base::SysInfo::CPUArchitecture() to OperatingSystemArchitecture().

base/sys_info.h

Index: base/sys_info.h
===================================================================
--- base/sys_info.h	(revision 161772)
+++ base/sys_info.h	(working copy)
@@ -53,8 +53,7 @@
   // Exact return value may differ across platforms.
   // e.g. a 32-bit x86 kernel on a 64-bit capable CPU will return "x86",
   //      whereas a x86-64 kernel on the same CPU will return "x86_64"
-  // TODO(thestig) Rename this to OperatingSystemArchitecture().
-  static std::string CPUArchitecture();
+  static std::string OperatingSystemArchitecture();
 
   // Avoid using this. Use base/cpu.h to get information about the CPU instead.
   // http://crbug.com/148884