diff --git a/atom/browser/api/atom_api_session.cc b/atom/browser/api/atom_api_session.cc
index c898f5f1b33f..87d42486d503 100644
--- a/atom/browser/api/atom_api_session.cc
+++ b/atom/browser/api/atom_api_session.cc
@@ -285,6 +285,14 @@ void SetProxyInIO(net::URLRequestContextGetter* getter,
   RunCallbackInUI(callback);
 }
 
+void SetCertVerifyProcInIO(
+    const scoped_refptr<net::URLRequestContextGetter>& context_getter,
+    const AtomCertVerifier::VerifyProc& proc) {
+  auto request_context = context_getter->GetURLRequestContext();
+  static_cast<AtomCertVerifier*>(request_context->cert_verifier())->
+      SetVerifyProc(proc);
+}
+
 void ClearHostResolverCacheInIO(
     const scoped_refptr<net::URLRequestContextGetter>& context_getter,
     const base::Closure& callback) {
@@ -434,7 +442,10 @@ void Session::SetCertVerifyProc(v8::Local<v8::Value> val,
     return;
   }
 
-  browser_context_->cert_verifier()->SetVerifyProc(proc);
+  BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+      base::Bind(&SetCertVerifyProcInIO,
+                 make_scoped_refptr(browser_context_->GetRequestContext()),
+                 proc));
 }
 
 void Session::SetPermissionRequestHandler(v8::Local<v8::Value> val,
diff --git a/atom/browser/atom_browser_context.cc b/atom/browser/atom_browser_context.cc
index 7b682543a09c..94cc3ee03d50 100644
--- a/atom/browser/atom_browser_context.cc
+++ b/atom/browser/atom_browser_context.cc
@@ -66,7 +66,6 @@ std::string RemoveWhitespace(const std::string& str) {
 AtomBrowserContext::AtomBrowserContext(const std::string& partition,
                                        bool in_memory)
     : brightray::BrowserContext(partition, in_memory),
-      cert_verifier_(new AtomCertVerifier),
       network_delegate_(new AtomNetworkDelegate) {
   // Construct user agent string.
   Browser* browser = Browser::Get();
@@ -174,7 +173,7 @@ content::PermissionManager* AtomBrowserContext::GetPermissionManager() {
 }
 
 std::unique_ptr<net::CertVerifier> AtomBrowserContext::CreateCertVerifier() {
-  return make_scoped_ptr(cert_verifier_);
+  return std::unique_ptr<net::CertVerifier>(new AtomCertVerifier);
 }
 
 net::SSLConfigService* AtomBrowserContext::CreateSSLConfigService() {
diff --git a/atom/browser/atom_browser_context.h b/atom/browser/atom_browser_context.h
index f793bc9870d6..732f1d045731 100644
--- a/atom/browser/atom_browser_context.h
+++ b/atom/browser/atom_browser_context.h
@@ -12,7 +12,6 @@
 namespace atom {
 
 class AtomDownloadManagerDelegate;
-class AtomCertVerifier;
 class AtomNetworkDelegate;
 class AtomPermissionManager;
 class WebViewManager;
@@ -42,7 +41,6 @@ class AtomBrowserContext : public brightray::BrowserContext {
   // brightray::BrowserContext:
   void RegisterPrefs(PrefRegistrySimple* pref_registry) override;
 
-  AtomCertVerifier* cert_verifier() const { return cert_verifier_; }
   AtomNetworkDelegate* network_delegate() const { return network_delegate_; }
 
  private:
@@ -52,7 +50,6 @@ class AtomBrowserContext : public brightray::BrowserContext {
   std::string user_agent_;
 
   // Managed by brightray::BrowserContext.
-  AtomCertVerifier* cert_verifier_;
   AtomNetworkDelegate* network_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(AtomBrowserContext);
diff --git a/atom/browser/net/atom_cert_verifier.cc b/atom/browser/net/atom_cert_verifier.cc
index adfba7060c90..dd588b9501ce 100644
--- a/atom/browser/net/atom_cert_verifier.cc
+++ b/atom/browser/net/atom_cert_verifier.cc
@@ -36,7 +36,6 @@ AtomCertVerifier::~AtomCertVerifier() {
 }
 
 void AtomCertVerifier::SetVerifyProc(const VerifyProc& proc) {
-  base::AutoLock auto_lock(lock_);
   verify_proc_ = proc;
 }
 
@@ -52,20 +51,14 @@ int AtomCertVerifier::Verify(
     const net::BoundNetLog& net_log) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
-  VerifyProc proc;
-  {
-    base::AutoLock auto_lock(lock_);
-    proc = verify_proc_;
-  }
-
-  if (proc.is_null())
+  if (verify_proc_.is_null())
     return default_cert_verifier_->Verify(
         cert, hostname, ocsp_response, flags, crl_set, verify_result, callback,
         out_req, net_log);
 
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
-      base::Bind(proc, hostname, make_scoped_refptr(cert),
+      base::Bind(verify_proc_, hostname, make_scoped_refptr(cert),
                  base::Bind(OnResult, verify_result, callback)));
   return net::ERR_IO_PENDING;
 }
diff --git a/atom/browser/net/atom_cert_verifier.h b/atom/browser/net/atom_cert_verifier.h
index e00ba260ec3f..c8b4bf9290bb 100644
--- a/atom/browser/net/atom_cert_verifier.h
+++ b/atom/browser/net/atom_cert_verifier.h
@@ -5,10 +5,9 @@
 #ifndef ATOM_BROWSER_NET_ATOM_CERT_VERIFIER_H_
 #define ATOM_BROWSER_NET_ATOM_CERT_VERIFIER_H_
 
+#include <memory>
 #include <string>
 
-#include "base/memory/ref_counted.h"
-#include "base/synchronization/lock.h"
 #include "net/cert/cert_verifier.h"
 
 namespace atom {
@@ -39,7 +38,6 @@ class AtomCertVerifier : public net::CertVerifier {
   bool SupportsOCSPStapling() override;
 
  private:
-  base::Lock lock_;
   VerifyProc verify_proc_;
   std::unique_ptr<net::CertVerifier> default_cert_verifier_;