Convert unnecessary ContextLifecycleObservers into ContextClients.

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

Index: third_party/WebKit/Source/core/css/FontFace.cpp
diff --git a/third_party/WebKit/Source/core/css/FontFace.cpp b/third_party/WebKit/Source/core/css/FontFace.cpp
index 8aabfcb5968809b684c282c448e42d6038d2a26c..b9b5f639df01d5b00c71285533e33b6ba070bfc8 100644
--- a/third_party/WebKit/Source/core/css/FontFace.cpp
+++ b/third_party/WebKit/Source/core/css/FontFace.cpp
@@ -157,12 +157,12 @@ FontFace* FontFace::create(Document* document,
 }
 
 FontFace::FontFace(ExecutionContext* context)
-    : ContextLifecycleObserver(context), m_status(Unloaded) {}
+    : ContextClient(context), m_status(Unloaded) {}
 
 FontFace::FontFace(ExecutionContext* context,
                    const AtomicString& family,
                    const FontFaceDescriptors& descriptors)
-    : ContextLifecycleObserver(context), m_family(family), m_status(Unloaded) {
+    : ContextClient(context), m_family(family), m_status(Unloaded) {
   Document* document = toDocument(context);
   setPropertyFromString(document, descriptors.style(), CSSPropertyFontStyle);
   setPropertyFromString(document, descriptors.weight(), CSSPropertyFontWeight);
@@ -666,7 +666,7 @@ DEFINE_TRACE(FontFace) {
   visitor->trace(m_loadedProperty);
   visitor->trace(m_cssFontFace);
   visitor->trace(m_callbacks);
-  ContextLifecycleObserver::trace(visitor);
+  ContextClient::trace(visitor);
 }
 
 bool FontFace::hadBlankText() const {