Make the windows_version.h functions threadsafe by using a singleton. Add accessors to the singl...

sandbox/src/Wow64.cc

Index: sandbox/src/Wow64.cc
===================================================================
--- sandbox/src/Wow64.cc	(revision 80824)
+++ sandbox/src/Wow64.cc	(working copy)
@@ -88,7 +88,8 @@
 // bit version of ntdll is loaded, we'll remove the interception and return to
 // our caller.
 bool Wow64::WaitForNtdll() {
-  if (base::win::GetWOW64Status() != base::win::WOW64_ENABLED)
+  if (base::win::OSInfo::GetInstance()->wow64_status() !=
+      base::win::OSInfo::WOW64_ENABLED)
     return true;
 
   const size_t page_size = 4096;