Add DCHECKs to validate ProfileIOData's list of protocols.

chrome/browser/custom_handlers/protocol_handler_registry.h

 // Copyright (c) 2012 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_CUSTOM_HANDLERS_PROTOCOL_HANDLER_REGISTRY_H_
 #define CHROME_BROWSER_CUSTOM_HANDLERS_PROTOCOL_HANDLER_REGISTRY_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 30 matching lines @@
   };
 
   // |Delegate| provides an interface for interacting asynchronously
   // with the underlying OS for the purposes of registering Chrome
   // as the default handler for specific protocols.
   class Delegate {
    public:
     virtual ~Delegate();
     virtual void RegisterExternalHandler(const std::string& protocol);
     virtual void DeregisterExternalHandler(const std::string& protocol);
-    virtual bool IsExternalHandlerRegistered(const std::string& protocol);
+    virtual bool CanSchemeBeOverridden(const std::string& protocol);
     virtual scoped_refptr<shell_integration::DefaultProtocolClientWorker>
     CreateShellWorker(
         const shell_integration::DefaultWebClientWorkerCallback& callback,
         const std::string& protocol);
     virtual void RegisterWithOSAsDefaultClient(
         const std::string& protocol,
         ProtocolHandlerRegistry* registry);
   };
 
   // Forward declaration of the internal implementation class.
@@ skipping 302 matching lines @@
   // are posted to the IO thread where updates are applied to this object.
   scoped_refptr<IOThreadDelegate> io_thread_delegate_;
 
   // Makes it possible to invalidate the callback for the
   // DefaultProtocolClientWorker.
   base::WeakPtrFactory<ProtocolHandlerRegistry> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProtocolHandlerRegistry);
 };
 #endif  // CHROME_BROWSER_CUSTOM_HANDLERS_PROTOCOL_HANDLER_REGISTRY_H_