Remove ContextLifecycleObserver from V8V0CustomElementLifecycleCallbacks

third_party/WebKit/Source/bindings/core/v8/V8V0CustomElementLifecycleCallbacks.h

Index: third_party/WebKit/Source/bindings/core/v8/V8V0CustomElementLifecycleCallbacks.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8V0CustomElementLifecycleCallbacks.h b/third_party/WebKit/Source/bindings/core/v8/V8V0CustomElementLifecycleCallbacks.h
index 86a76254773256cbccf40a20cda408ea00c17585..7a36751cae47cc18fe06f55782153afb4f9d139b 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8V0CustomElementLifecycleCallbacks.h
+++ b/third_party/WebKit/Source/bindings/core/v8/V8V0CustomElementLifecycleCallbacks.h
@@ -33,7 +33,6 @@
 
 #include "bindings/core/v8/ScopedPersistent.h"
 #include "bindings/core/v8/ScriptState.h"
-#include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/custom/V0CustomElementLifecycleCallbacks.h"
 #include "wtf/PassRefPtr.h"
 #include <memory>
@@ -46,10 +45,7 @@ class Element;
 class V8PerContextData;
 
 class V8V0CustomElementLifecycleCallbacks final
-    : public V0CustomElementLifecycleCallbacks,
-      public ContextLifecycleObserver {
-  USING_GARBAGE_COLLECTED_MIXIN(V8V0CustomElementLifecycleCallbacks);
-
+    : public V0CustomElementLifecycleCallbacks {
  public:
   static V8V0CustomElementLifecycleCallbacks* create(
       ScriptState*,