Separate CryptoVerifyImpl into its own file.

chrome/browser/extensions/api/networking_private/networking_private_service_client.h

Index: chrome/browser/extensions/api/networking_private/networking_private_service_client.h
diff --git a/chrome/browser/extensions/api/networking_private/networking_private_service_client.h b/chrome/browser/extensions/api/networking_private/networking_private_service_client.h
index beb55eaaf0c6dcae62dfb2007f0667a35c1bd8bb..63708c5bd55f5125c5f29284ba3d580648b6f5b2 100644
--- a/chrome/browser/extensions/api/networking_private/networking_private_service_client.h
+++ b/chrome/browser/extensions/api/networking_private/networking_private_service_client.h
@@ -64,9 +64,11 @@ class NetworkingPrivateServiceClient
       std::string public_key;
     };
 
-    CryptoVerify() {}
-    virtual ~CryptoVerify() {}
+    CryptoVerify();
+    virtual ~CryptoVerify();
 
+    // Must be provided by the implementation. May return NULL if certificate
+    // verification is unavailable, see NetworkingPrivateServiceClient().
     static CryptoVerify* Create();
 
     virtual void VerifyDestination(const Credentials& credentials,
@@ -104,7 +106,8 @@ class NetworkingPrivateServiceClient
 
   // Takes ownership of |wifi_service| and |crypto_verify|. They are accessed
   // and deleted on the worker thread. The deletion task is posted during the
-  // NetworkingPrivateServiceClient shutdown.
+  // NetworkingPrivateServiceClient shutdown. |crypto_verify| may be NULL in
+  // which case Verify* will return a 'not implemented' error.

[mef, 2014/08/07 22:57:39]

nit: It returns kErrorNotSupported.

   NetworkingPrivateServiceClient(wifi::WiFiService* wifi_service,
                                  CryptoVerify* crypto_verify);
 
@@ -254,6 +257,7 @@ class NetworkingPrivateServiceClient
   // Observers to Network Events.
   ObserverList<Observer> network_events_observers_;
   // Interface for Verify* methods. Used and deleted on the worker thread.
+  // May be NULL.
   scoped_ptr<CryptoVerify> crypto_verify_;
   // Interface to WiFiService. Used and deleted on the worker thread.
   scoped_ptr<wifi::WiFiService> wifi_service_;