Replace DOMWindowProperty in core/ with ContextClient

third_party/WebKit/Source/core/css/StyleMedia.h

Index: third_party/WebKit/Source/core/css/StyleMedia.h
diff --git a/third_party/WebKit/Source/core/css/StyleMedia.h b/third_party/WebKit/Source/core/css/StyleMedia.h
index 9df973e3076c55296a8a8266f8a6cbd191c7fd37..da228d9e5d2ec754053ab8f25ad46910a4310888 100644
--- a/third_party/WebKit/Source/core/css/StyleMedia.h
+++ b/third_party/WebKit/Source/core/css/StyleMedia.h
@@ -28,7 +28,7 @@
 #define StyleMedia_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
-#include "core/frame/DOMWindowProperty.h"
+#include "core/dom/ContextLifecycleObserver.h"
 #include "platform/heap/Handle.h"
 #include "wtf/text/WTFString.h"
 
@@ -37,8 +37,8 @@ namespace blink {
 class LocalFrame;
 
 class StyleMedia final : public GarbageCollected<StyleMedia>,
-                         public DOMWindowProperty,
-                         public ScriptWrappable {
+                         public ScriptWrappable,
+                         public ContextClient {

[haraken, 2016/12/21 10:01:09]

ScriptWrappable must be the left-most class to make the wrapper tracing work.
This was not a problem because StyleMedia was not traced by TRACE_WRAPPERS.

[sof, 2016/12/21 10:10:48]

leftmost (GC) mixin? Got a pointer to where this is covered/discussed?

   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(StyleMedia);