Update interfaces/media-source.idl (#21504)

Source: https://github.com/tidoust/reffy-reports/blob/cbe0bd9/ed/idl/media-source.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/643650371
diff --git a/interfaces/media-source.idl b/interfaces/media-source.idl
index 1d3c02d..f718db1 100644
--- a/interfaces/media-source.idl
+++ b/interfaces/media-source.idl
@@ -16,19 +16,19 @@
 
 [Constructor]
 interface MediaSource : EventTarget {
-    readonly attribute SourceBufferList    sourceBuffers;
-    readonly attribute SourceBufferList    activeSourceBuffers;
-    readonly attribute ReadyState          readyState;
-             attribute unrestricted double duration;
-             attribute EventHandler        onsourceopen;
-             attribute EventHandler        onsourceended;
-             attribute EventHandler        onsourceclose;
-    SourceBuffer addSourceBuffer(DOMString type);
-    void         removeSourceBuffer(SourceBuffer sourceBuffer);
-    void         endOfStream(optional EndOfStreamError error);
-    void         setLiveSeekableRange(double start, double end);
-    void         clearLiveSeekableRange();
-    static boolean isTypeSupported(DOMString type);
+    readonly        attribute SourceBufferList    sourceBuffers;
+    readonly        attribute SourceBufferList    activeSourceBuffers;
+    readonly        attribute ReadyState          readyState;
+                    attribute unrestricted double duration;
+                    attribute EventHandler        onsourceopen;
+                    attribute EventHandler        onsourceended;
+                    attribute EventHandler        onsourceclose;
+    SourceBuffer   addSourceBuffer (DOMString type);
+    void           removeSourceBuffer (SourceBuffer sourceBuffer);
+    void           endOfStream (optional EndOfStreamError error);
+    void           setLiveSeekableRange (double start, double end);
+    void           clearLiveSeekableRange ();
+    static boolean isTypeSupported (DOMString type);
 };
 
 enum AppendMode {
@@ -37,45 +37,45 @@
 };
 
 interface SourceBuffer : EventTarget {
-             attribute AppendMode          mode;
-    readonly attribute boolean             updating;
-    readonly attribute TimeRanges          buffered;
-             attribute double              timestampOffset;
-    readonly attribute AudioTrackList      audioTracks;
-    readonly attribute VideoTrackList      videoTracks;
-    readonly attribute TextTrackList       textTracks;
-             attribute double              appendWindowStart;
-             attribute unrestricted double appendWindowEnd;
-             attribute EventHandler        onupdatestart;
-             attribute EventHandler        onupdate;
-             attribute EventHandler        onupdateend;
-             attribute EventHandler        onerror;
-             attribute EventHandler        onabort;
-    void appendBuffer(BufferSource data);
-    void abort();
-    void remove(double start, unrestricted double end);
+                    attribute AppendMode          mode;
+    readonly        attribute boolean             updating;
+    readonly        attribute TimeRanges          buffered;
+                    attribute double              timestampOffset;
+    readonly        attribute AudioTrackList      audioTracks;
+    readonly        attribute VideoTrackList      videoTracks;
+    readonly        attribute TextTrackList       textTracks;
+                    attribute double              appendWindowStart;
+                    attribute unrestricted double appendWindowEnd;
+                    attribute EventHandler        onupdatestart;
+                    attribute EventHandler        onupdate;
+                    attribute EventHandler        onupdateend;
+                    attribute EventHandler        onerror;
+                    attribute EventHandler        onabort;
+    void appendBuffer (BufferSource data);
+    void abort ();
+    void remove (double start, unrestricted double end);
 };
 
 interface SourceBufferList : EventTarget {
-    readonly attribute unsigned long length;
-             attribute EventHandler  onaddsourcebuffer;
-             attribute EventHandler  onremovesourcebuffer;
+    readonly        attribute unsigned long length;
+                    attribute EventHandler  onaddsourcebuffer;
+                    attribute EventHandler  onremovesourcebuffer;
     getter SourceBuffer (unsigned long index);
 };
 
 [Exposed=Window]
 partial interface URL {
-    static DOMString createObjectURL(MediaSource mediaSource);
+    static DOMString createObjectURL (MediaSource mediaSource);
 };
 
 partial interface AudioTrack {
-    readonly attribute SourceBuffer? sourceBuffer;
+    readonly        attribute SourceBuffer? sourceBuffer;
 };
 
 partial interface VideoTrack {
-    readonly attribute SourceBuffer? sourceBuffer;
+    readonly        attribute SourceBuffer? sourceBuffer;
 };
 
 partial interface TextTrack {
-    readonly attribute SourceBuffer? sourceBuffer;
+    readonly        attribute SourceBuffer? sourceBuffer;
 };