Make the windows_version.h functions threadsafe by using a singleton.

chrome/browser/bug_report_util.cc

Index: chrome/browser/bug_report_util.cc
===================================================================
--- chrome/browser/bug_report_util.cc	(revision 80528)
+++ chrome/browser/bug_report_util.cc	(working copy)
@@ -13,6 +13,7 @@
 #include "base/memory/singleton.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
+#include "base/win/windows_version.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/browser_process_impl.h"
 #include "chrome/browser/profiles/profile.h"
@@ -156,21 +157,14 @@
 }
 
 // static
-void BugReportUtil::SetOSVersion(std::string *os_version) {
+void BugReportUtil::SetOSVersion(std::string* os_version) {
 #if defined(OS_WIN)
-  OSVERSIONINFO osvi;
-  ZeroMemory(&osvi, sizeof(OSVERSIONINFO));
-  osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
-
-  if (GetVersionEx(&osvi)) {
-    *os_version = StringPrintf("%d.%d.%d %S",
-      osvi.dwMajorVersion,
-      osvi.dwMinorVersion,
-      osvi.dwBuildNumber,
-      osvi.szCSDVersion);
-  } else {
-    *os_version = "unknown";
-  }
+  OSInfo* os_info = base::win::OSInfo::GetInstance();
+  const int* version = os_info->version_number();
+  *os_version = StringPrintf("%d.%d.%d", version[0], version[1], version[2]);
+  int service_pack = os_info->service_pack()[0];
+  if (service_pack > 0)
+    os_version->append(StringPrintf("Service Pack %d", service_pack));
 #elif defined(OS_MACOSX)
   int32 major;
   int32 minor;