Add RTCCertificate IDL test

[soareschen]

This change is 

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Firefox (nightly channel)

Testing web-platform-tests at revision 948ba57
Using browser at version BuildID 20170425101537; SourceStamp a30dc237c3a600a5231f2974fc2b85dfb5513414
Starting 10 test iterations
All results were stable

All results

1 test ran

/webrtc/RTCCertificate-idl.html

Subtest	Results	Messages
	OK
RTCCertificate IDL Test	PASS
RTCCertificate interface: existence and properties of interface object	PASS
RTCCertificate interface object length	PASS
RTCCertificate interface object name	PASS
RTCCertificate interface: existence and properties of interface prototype object	PASS
RTCCertificate interface: existence and properties of interface prototype object's "constructor" property	PASS
RTCCertificate interface: attribute expires	PASS
RTCCertificate interface: attribute fingerprints	FAIL	assert_true: The prototype object must have a property "fingerprints" expected true got false
RTCCertificate interface: operation getAlgorithm()	FAIL	assert_own_property: interface prototype object missing non-static operation expected property "getAlgorithm" missing
RTCCertificate must be primary interface of rtcCert	PASS
Stringification of rtcCert	PASS
RTCCertificate interface: rtcCert must inherit property "expires" with the proper type (0)	PASS
RTCCertificate interface: rtcCert must inherit property "fingerprints" with the proper type (1)	FAIL	assert_inherits: property "fingerprints" not found in prototype chain
RTCCertificate interface: rtcCert must inherit property "getAlgorithm" with the proper type (2)	FAIL	assert_inherits: property "getAlgorithm" not found in prototype chain

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Chrome (unstable channel)

Testing web-platform-tests at revision 948ba57
Using browser at version 59.0.3071.25 dev
Starting 10 test iterations
All results were stable

All results

1 test ran

/webrtc/RTCCertificate-idl.html

Subtest	Results	Messages
	OK
RTCCertificate IDL Test	PASS
RTCCertificate interface: existence and properties of interface object	PASS
RTCCertificate interface object length	PASS
RTCCertificate interface object name	PASS
RTCCertificate interface: existence and properties of interface prototype object	FAIL	assert_equals: class string of RTCCertificate.prototype expected "[object RTCCertificatePrototype]" but got "[object RTCCertificate]"
RTCCertificate interface: existence and properties of interface prototype object's "constructor" property	PASS
RTCCertificate interface: attribute expires	PASS
RTCCertificate interface: attribute fingerprints	FAIL	assert_true: The prototype object must have a property "fingerprints" expected true got false
RTCCertificate interface: operation getAlgorithm()	FAIL	assert_own_property: interface prototype object missing non-static operation expected property "getAlgorithm" missing
RTCCertificate must be primary interface of rtcCert	PASS
Stringification of rtcCert	PASS
RTCCertificate interface: rtcCert must inherit property "expires" with the proper type (0)	PASS
RTCCertificate interface: rtcCert must inherit property "fingerprints" with the proper type (1)	FAIL	assert_inherits: property "fingerprints" not found in prototype chain
RTCCertificate interface: rtcCert must inherit property "getAlgorithm" with the proper type (2)	FAIL	assert_inherits: property "getAlgorithm" not found in prototype chain

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These tests are now available on w3c-test.org

[agouaillard]

see #5693