WebCrypto: Implement importKey() and sign() for HMAC in NSS

BUG=245025
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Review URL: https://chromiumcodereview.appspot.com/23569007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@223813 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed