Reland 66791 (change was innocent)...

net/base/x509_certificate_mac.cc

Index: net/base/x509_certificate_mac.cc
===================================================================
--- net/base/x509_certificate_mac.cc	(revision 66806)
+++ net/base/x509_certificate_mac.cc	(working copy)
@@ -8,6 +8,7 @@
 #include <Security/Security.h>
 #include <time.h>
 
+#include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/pickle.h"
 #include "base/mac/scoped_cftyperef.h"
@@ -21,6 +22,8 @@
 
 namespace net {
 
+namespace {
+
 class MacTrustedCertificates {
  public:
   // Sets the trusted root certificate used by tests. Call with |cert| set
@@ -57,7 +60,7 @@
     return merged_array;
   }
  private:
-  friend struct DefaultSingletonTraits<MacTrustedCertificates>;
+  friend struct base::DefaultLazyInstanceTraits<MacTrustedCertificates>;
 
   // Obtain an instance of MacTrustedCertificates via the singleton
   // interface.
@@ -73,12 +76,10 @@
   DISALLOW_COPY_AND_ASSIGN(MacTrustedCertificates);
 };
 
-void SetMacTestCertificate(X509Certificate* cert) {
-  Singleton<MacTrustedCertificates>::get()->SetTestCertificate(cert);
-}
+base::LazyInstance<MacTrustedCertificates,
+    base::LeakyLazyInstanceTraits<MacTrustedCertificates> >
+    g_mac_trusted_certificates(base::LINKER_INITIALIZED);
 
-namespace {
-
 typedef OSStatus (*SecTrustCopyExtendedResultFuncPtr)(SecTrustRef,
                                                       CFDictionaryRef*);
 
@@ -443,6 +444,10 @@
 
 }  // namespace
 
+void SetMacTestCertificate(X509Certificate* cert) {
+  g_mac_trusted_certificates.Get().SetTestCertificate(cert);
+}
+
 void X509Certificate::Initialize() {
   const CSSM_X509_NAME* name;
   OSStatus status = SecCertificateGetSubject(cert_handle_, &name);
@@ -545,7 +550,7 @@
   // Set the trusted anchor certificates for the SecTrustRef by merging the
   // system trust anchors and the test root certificate.
   CFArrayRef anchor_array =
-      Singleton<MacTrustedCertificates>::get()->CopyTrustedCertificateArray();
+      g_mac_trusted_certificates.Get().CopyTrustedCertificateArray();
   ScopedCFTypeRef<CFArrayRef> scoped_anchor_array(anchor_array);
   if (anchor_array) {
     status = SecTrustSetAnchorCertificates(trust_ref, anchor_array);