Make net::CertDatabase and PKCS12InitSingleton singletons Leaky.

net/third_party/mozilla_security_manager/nsPKCS12Blob.cpp

Index: net/third_party/mozilla_security_manager/nsPKCS12Blob.cpp
diff --git a/net/third_party/mozilla_security_manager/nsPKCS12Blob.cpp b/net/third_party/mozilla_security_manager/nsPKCS12Blob.cpp
index 793d8f73a74ed22a72b0d5eba5c744025944cffe..0cf3500c6d3ad71abb6ef859c1d99658a2abd080 100644
--- a/net/third_party/mozilla_security_manager/nsPKCS12Blob.cpp
+++ b/net/third_party/mozilla_security_manager/nsPKCS12Blob.cpp
@@ -340,7 +340,9 @@ class PKCS12InitSingleton {
   }
 };
 
-static base::LazyInstance<PKCS12InitSingleton> g_pkcs12_init_singleton =
+// Leaky so it can be initialized on worker threads and because there is no
+// cleanup necessary.
+static base::LazyInstance<PKCS12InitSingleton>::Leaky g_pkcs12_init_singleton =
     LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace