Roll 50: Copied IDLs, PYTHON scripts from WebKit removed deleted files in WebCore

modules/mediasource/SourceBuffer.idl

Index: modules/mediasource/SourceBuffer.idl
diff --git a/modules/mediasource/SourceBuffer.idl b/modules/mediasource/SourceBuffer.idl
index 6329078820ef0e3af0c8f6bb78cd1cf4122203e2..a3f206ecda904027c96a0366d1bb71584fe10c67 100644
--- a/modules/mediasource/SourceBuffer.idl
+++ b/modules/mediasource/SourceBuffer.idl
@@ -36,15 +36,12 @@ enum AppendMode {
 };
 
 [
-    ActiveDOMObject,
-    NoInterfaceObject,
+    DependentLifetime,
     RuntimeEnabled=MediaSource,
-    TypeChecking=Interface,
 ] interface SourceBuffer : EventTarget {
 
     // Gets or sets the AppendMode.
-    // FIXME: Remove MediaSourceExperimental once mode attribute is implemented and stabilized. See http://crbug.com/249422.
-    [RaisesException=Setter, RuntimeEnabled=MediaSourceExperimental] attribute AppendMode mode;
+    [RaisesException=Setter] attribute AppendMode mode;
 
     readonly attribute boolean updating;
 
@@ -74,4 +71,3 @@ enum AppendMode {
     // the initialization segment algorithm.
     [RaisesException=Setter, RuntimeEnabled=MediaSourceExperimental] attribute TrackDefaultList trackDefaults;
 };
-