Remove dependency of SSLPlatformKeyTaskRunner on single-threaded SequencedWorkerPool.

net/ssl/ssl_platform_key_win.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/ssl/ssl_platform_key.h"
 
 #include <windows.h>
 #include <NCrypt.h>
 
 #include <algorithm>
@@ skipping 338 matching lines @@
   CHECK_EQ(must_free, TRUE);
 
   std::unique_ptr<ThreadedSSLPrivateKey::Delegate> delegate;
   if (key_spec == CERT_NCRYPT_KEY_SPEC) {
     delegate.reset(new SSLPlatformKeyCNG(prov_or_key, key_type, max_length));
   } else {
     DCHECK(SSLPrivateKey::Type::RSA == key_type);
     delegate.reset(new SSLPlatformKeyCAPI(prov_or_key, key_spec, max_length));
   }
   return make_scoped_refptr(new ThreadedSSLPrivateKey(
-      std::move(delegate), GetSSLPlatformKeyTaskRunner()));
+      std::move(delegate), SSLPlatformKeyTaskRunner::Get()));
 }
 
 }  // namespace net