Revert "Add Client Attribute to FetchEvent- Blink Side."

Source/modules/serviceworkers/FetchEvent.cpp

Index: Source/modules/serviceworkers/FetchEvent.cpp
diff --git a/Source/modules/serviceworkers/FetchEvent.cpp b/Source/modules/serviceworkers/FetchEvent.cpp
index 1765234b0e15a4f63497b23535425576ff08e24f..625809d23bb227614629dca0f95dbad732df4675 100644
--- a/Source/modules/serviceworkers/FetchEvent.cpp
+++ b/Source/modules/serviceworkers/FetchEvent.cpp
@@ -33,11 +33,6 @@ Request* FetchEvent::request() const
     return m_request;
 }
 
-ServiceWorkerClient* FetchEvent::client() const
-{
-    return m_client;
-}
-
 bool FetchEvent::isReload() const
 {
     return m_isReload;
@@ -65,8 +60,6 @@ FetchEvent::FetchEvent(const AtomicString& type, const FetchEventInit& initializ
 {
     if (initializer.hasRequest())
         m_request = initializer.request();
-    if (initializer.hasClient())
-        m_client = initializer.client();
     m_isReload = initializer.isReload();
 }
 
@@ -74,7 +67,6 @@ DEFINE_TRACE(FetchEvent)
 {
     visitor->trace(m_observer);
     visitor->trace(m_request);
-    visitor->trace(m_client);
     ExtendableEvent::trace(visitor);
 }