Optional
aInstancePtr: objectA run time mechanism for interface discovery.
NS_OK if the interface is supported by the associated instance, NS_NOINTERFACE if it is not.
aInstancePtr must not be null.
[in] A requested interface IID
[out] A pointer to an interface pointer to receive the result.
Create the chrome side of the IPC protocol and join an existing 'real' channel on the parent process. The id is provided by nsIRedirectChannelRegistrar on the chrome process and pushed to the child protocol as an argument to event starting a redirect.
Primarilly used in HttpChannelChild::Redirect1Begin on a newly created child channel, where the new channel is intended to be created on the child process.
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Implemented by content side of IPC protocols.