Fix cyclic dependency between ProfilePolicyConnector and PrefService.

chrome/browser/chromeos/policy/policy_cert_verifier.h

 // Copyright (c) 2013 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_POLICY_POLICY_CERT_VERIFIER_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_POLICY_CERT_VERIFIER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "net/base/completion_callback.h"
 #include "net/cert/cert_trust_anchor_provider.h"
 #include "net/cert/cert_verifier.h"
 
 namespace net {
+class CertVerifyResult;
 class X509Certificate;
 typedef std::vector<scoped_refptr<X509Certificate> > CertificateList;
 }
 
 namespace policy {
 
 // Wraps a MultiThreadedCertVerifier to make it use the additional trust anchors
 // configured by the ONC user policy.
 class PolicyCertVerifier : public net::CertVerifier,
                            public net::CertTrustAnchorProvider {
  public:
-  // This object must be created on the UI thread. It's member functions and
-  // destructor must be called on the IO thread. |anchor_used_callback| is
-  // called on the IO thread everytime a certificate from the additional trust
-  // anchors (set with SetTrustAnchors) is used.
+  // This object must be created on the UI thread. |anchor_used_callback| is
+  // called on the UI thread everytime a certificate from the additional trust
+  // anchors (set with SetTrustAnchors) is used. These notifications are stopped
+  // once UnsetTrustAnchorUsedCallback is called.
   explicit PolicyCertVerifier(const base::Closure& anchor_used_callback);
   virtual ~PolicyCertVerifier();
 
   void InitializeOnIOThread();
 
+  // To be called on the UI thread. Unsets |anchor_used_callback| from the
+  // constructor. Until this is called, that callback is run for usages of
+  // additional trust anchors.
+  void UnsetTrustAnchorUsedCallback();
+
+  // To be called on the IO thread. Sets the additional trust anchors.
   void SetTrustAnchors(const net::CertificateList& trust_anchors);
 
   // CertVerifier:
   // Note: |callback| can be null.
   virtual int Verify(net::X509Certificate* cert,
                      const std::string& hostname,
                      int flags,
                      net::CRLSet* crl_set,
                      net::CertVerifyResult* verify_result,
                      const net::CompletionCallback& callback,
                      RequestHandle* out_req,
                      const net::BoundNetLog& net_log) OVERRIDE;
 
   virtual void CancelRequest(RequestHandle req) OVERRIDE;
 
   // CertTrustAnchorProvider:
   virtual const net::CertificateList& GetAdditionalTrustAnchors() OVERRIDE;
 
  private:
+  void NotifyOnUI();
+
+  static void MaybeSignalAnchorUse(
+      int error,
+      const net::CertVerifyResult& verify_result,
+      const base::WeakPtr<PolicyCertVerifier>& weak_ptr);
+
+  static void CompleteAndSignalAnchorUse(
+      const net::CompletionCallback& completion_callback,
+      const net::CertVerifyResult* verify_result,
+      const base::WeakPtr<PolicyCertVerifier>& weak_ptr,
+      int error);
+
+  // Access on IO thread.
   net::CertificateList trust_anchors_;
+
+  // Access on IO thread.
+  scoped_ptr<CertVerifier> delegate_;
+
+  // Access on UI thread.
   base::Closure anchor_used_callback_;
-  scoped_ptr<CertVerifier> delegate_;
+
+  // Must be constructed, modified, and invalidated on the UI thread.
+  base::WeakPtrFactory<PolicyCertVerifier> weak_ptr_factory_;
+
+  // Must be constructed and dereferenced on the UI thread. This WeakPtr has to
+  // be used for callbacks from the IO thread to the UI thread.
+  base::WeakPtr<PolicyCertVerifier> weak_ptr_;
 
   DISALLOW_COPY_AND_ASSIGN(PolicyCertVerifier);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_POLICY_CERT_VERIFIER_H_