Convert unnecessary ContextLifecycleObservers into ContextClients.

third_party/WebKit/Source/modules/presentation/PresentationRequest.cpp

Index: third_party/WebKit/Source/modules/presentation/PresentationRequest.cpp
diff --git a/third_party/WebKit/Source/modules/presentation/PresentationRequest.cpp b/third_party/WebKit/Source/modules/presentation/PresentationRequest.cpp
index 7f2e17eff9db3cb51db76acdeef5446f980eb9fb..361422438fff38979350668503479c75aecd251a 100644
--- a/third_party/WebKit/Source/modules/presentation/PresentationRequest.cpp
+++ b/third_party/WebKit/Source/modules/presentation/PresentationRequest.cpp
@@ -109,7 +109,7 @@ const AtomicString& PresentationRequest::interfaceName() const {
 }
 
 ExecutionContext* PresentationRequest::getExecutionContext() const {
-  return ContextLifecycleObserver::getExecutionContext();
+  return ContextClient::getExecutionContext();
 }
 
 void PresentationRequest::addedEventListener(
@@ -221,12 +221,12 @@ const Vector<KURL>& PresentationRequest::urls() const {
 DEFINE_TRACE(PresentationRequest) {
   visitor->trace(m_availabilityProperty);
   EventTargetWithInlineData::trace(visitor);
-  ContextLifecycleObserver::trace(visitor);
+  ContextClient::trace(visitor);
 }
 
 PresentationRequest::PresentationRequest(ExecutionContext* executionContext,
                                          const Vector<KURL>& urls)
-    : ContextLifecycleObserver(executionContext), m_urls(urls) {
+    : ContextClient(executionContext), m_urls(urls) {
   recordOriginTypeAccess(executionContext);
 }