Canary versions no longer always remove protocol handlers at startup.

chrome/browser/shell_integration.h

 // Copyright (c) 2011 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_SHELL_INTEGRATION_H_
 #define CHROME_BROWSER_SHELL_INTEGRATION_H_
 #pragma once
 
 #include <string>
 
@@ skipping 20 matching lines @@
   static bool SetAsDefaultBrowser();
 
   // Sets Chrome as the default client application for the given protocol
   // (only for the current user). Returns false if this operation fails.
   static bool SetAsDefaultProtocolClient(const std::string& protocol);
 
   // Returns true if the running browser can be set as the default browser.
   static bool CanSetAsDefaultBrowser();
 
   // Returns true if the running browser can be set as the default client
-  // application for the given protocol.
-  static bool CanSetAsDefaultProtocolClient(const std::string& protocol);
+  // application for specific protocols.
+  static bool CanSetAsDefaultProtocolClient();
 
   // On Linux, it may not be possible to determine or set the default browser
   // on some desktop environments or configurations. So, we use this enum and
   // not a plain bool. (Note however that if used like a bool, this enum will
   // have reasonable behavior.)
   enum DefaultWebClientState {
     NOT_DEFAULT_WEB_CLIENT = 0,
     IS_DEFAULT_WEB_CLIENT,
     UNKNOWN_DEFAULT_WEB_CLIENT = -1
   };
@@ skipping 211 matching lines @@
     // Set Chrome as the default handler for this protocol.
     virtual void SetAsDefault();
 
     std::string protocol_;
 
     DISALLOW_COPY_AND_ASSIGN(DefaultProtocolClientWorker);
   };
 };
 
 #endif  // CHROME_BROWSER_SHELL_INTEGRATION_H_