Rename DOMWindow interface to Window

Source/modules/mediasource/WindowMediaSource.idl

 /*
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-partial interface DOMWindow {
+partial interface Window {
     [EnabledAtRuntime=webKitMediaSource] attribute WebKitMediaSourceConstructor WebKitMediaSource;
     [EnabledAtRuntime=webKitMediaSource] attribute WebKitSourceBufferConstructor WebKitSourceBuffer;
     [EnabledAtRuntime=webKitMediaSource] attribute WebKitSourceBufferListConstructor WebKitSourceBufferList;
-};
+};