Remove WebIDL from explainer.md since they are now in the spec (#93)

Author: youennf

explainer.md

@@ -173,97 +173,6 @@ pc.ontrack = e => {
 }
 </pre>
 
-## API
-
-The following are the IDL modifications proposed by this API.
-Future iterations may add additional operations following a similar pattern.
-
-<pre>
-// New enum for video frame types. Will eventually re-use the equivalent defined
-// by WebCodecs.
-enum RTCEncodedVideoFrameType {
-    "empty",
-    "key",
-    "delta",
-};
-
-// New dictionaries for video and audio metadata.
-dictionary RTCEncodedVideoFrameMetadata {
-    long long frameId;
-    sequence&lt;long long&gt; dependencies;
-    unsigned short width;
-    unsigned short height;
-    long spatialIndex;
-    long temporalIndex;
-    long synchronizationSource;
-    sequence&lt;long&gt; contributingSources;
-};
-
-dictionary RTCEncodedAudioFrameMetadata {
-    long synchronizationSource;
-    sequence&lt;long&gt; contributingSources;
-};
-
-// New interfaces to define encoded video and audio frames. Will eventually
-// re-use or extend the equivalent defined in WebCodecs.
-// The additionalData fields contain metadata about the frame and will
-// eventually be exposed differently.
-interface RTCEncodedVideoFrame {
-    readonly attribute RTCEncodedVideoFrameType type;
-    readonly attribute unsigned long long timestamp;
-    attribute ArrayBuffer data;
-    RTCVideoFrameMetadata getMetadata();
-};
-
-interface RTCEncodedAudioFrame {
-    readonly attribute unsigned long long timestamp;
-    attribute ArrayBuffer data;
-    RTCAudioFrameMetadata getMetadata();
-};
-
-// New methods for RTCRtpSender and RTCRtpReceiver
-typedef (SFrameTransform or RTCRtpScriptTransform) RTCRtpTransform;
-
-// New methods for RTCRtpSender and RTCRtpReceiver
-partial interface RTCRtpSender {
-    attribute RTCRtpTransform? transform;
-};
-
-partial interface RTCRtpReceiver {
-    attribute RTCRtpTransform? transform;
-};
-
-[Exposed=(Window,Worker)]
-interface SFrameTransform {
-    constructor(optional SFrameTransformOptions options = {});
-    Promise<undefined> setEncryptionKey(CryptoKey key, optional unsigned long long keyID);
-};
-
-[Exposed=Worker]
-interface RTCTransformEvent : Event {
-    readonly attribute RTCRtpScriptTransformer transformer;
-};
-
-partial interface DedicatedWorkerGlobalScope {
-    attribute EventHandler onrtctransform;
-};
-
-// FIXME: We want to expose only in dedicated worker scopes.
-[Exposed=Worker]
-interface RTCRtpScriptTransformer {
-    readonly attribute ReadableStream readable;
-    readonly attribute WritableStream writable;
-    readonly attribute any options;
-};
-
-[Exposed=Window]
-interface RTCRtpScriptTransform {
-    constructor(Worker worker, optional any options);
-    // FIXME: add messaging methods.
-};
-
-</pre>
-
 ## Design considerations ##
 
 This design is built upon the Streams API. This is a natural interface