id-ecPublicKey is defined as the OID {iso(1) member-body(2) us(840)
ansi-x962(10045) keyType(2) ecPublicKey(1)}, and is the NSS default, so
remove the override code from CryptoKey.cpp that forced it to the legacy
id-ecDH code.
Differential Revision: https://phabricator.services.mozilla.com/D52570
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extra : moz-landing-system : lando