Convert unnecessary ContextLifecycleObservers into ContextClients.

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

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 41 matching lines @@
 class ExceptionState;
 class FontFaceDescriptors;
 class StringOrArrayBufferOrArrayBufferView;
 class StylePropertySet;
 class StyleRuleFontFace;
 class WebTaskRunner;
 
 class CORE_EXPORT FontFace : public GarbageCollectedFinalized<FontFace>,
                              public ScriptWrappable,
                              public ActiveScriptWrappable<FontFace>,
-                             public ContextLifecycleObserver {
+                             public ContextClient {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(FontFace);
   WTF_MAKE_NONCOPYABLE(FontFace);
 
  public:
   enum LoadStatusType { Unloaded, Loading, Loaded, Error };
 
   static FontFace* create(ExecutionContext*,
                           const AtomicString& family,
                           StringOrArrayBufferOrArrayBufferView&,
@@ skipping 106 matching lines @@
   Member<LoadedProperty> m_loadedProperty;
   Member<CSSFontFace> m_cssFontFace;
   HeapVector<Member<LoadFontCallback>> m_callbacks;
 };
 
 using FontFaceArray = HeapVector<Member<FontFace>>;
 
 }  // namespace blink
 
 #endif  // FontFace_h