Canary versions no longer always remove protocol handlers at startup.

chrome/browser/shell_integration_mac.mm

 // 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.
 
 #include "chrome/browser/shell_integration.h"
 
 #include "base/mac/mac_util.h"
 #include "base/mac/foundation_util.h"
 #include "chrome/common/chrome_version_info.h"
 #import "third_party/mozilla/NSWorkspace+Utils.h"
@@ skipping 20 matching lines @@
   return true;
 }
 
 // Sets Chromium as the default application to be used by the operating system
 // for the given protocol. This applies only for the current user. Returns false
 // if this cannot be done, or if the operation fails.
 bool ShellIntegration::SetAsDefaultProtocolClient(const std::string& protocol) {
   if (protocol.empty())
     return false;
 
-  if (!CanSetAsDefaultProtocolClient(protocol))
+  if (!CanSetAsDefaultProtocolClient())
     return false;
 
   // We really do want the main bundle here, not base::mac::MainAppBundle(),
   // which is the bundle for the framework.
   NSString* identifier = [[NSBundle mainBundle] bundleIdentifier];
   if (!identifier)
     return false;
 
   NSString* protocol_ns = [NSString stringWithUTF8String:protocol.c_str()];
   OSStatus return_code =
@@ skipping 68 matching lines @@
   // We really do want the main bundle here, not base::mac::MainAppBundle(),
   // which is the bundle for the framework.
   NSString* my_identifier = [[NSBundle mainBundle] bundleIdentifier];
   if (!my_identifier)
     return UNKNOWN_DEFAULT_WEB_CLIENT;
 
   NSString* protocol_ns = [NSString stringWithUTF8String:protocol.c_str()];
   return IsIdentifierDefaultProtocolClient(my_identifier, protocol_ns) ?
       IS_DEFAULT_WEB_CLIENT : NOT_DEFAULT_WEB_CLIENT;
 }