[ServiceWorker] Cleanup to remove old focus() code kept to not break Chromium.

Source/modules/serviceworkers/ServiceWorkerGlobalScopeClient.h

Index: Source/modules/serviceworkers/ServiceWorkerGlobalScopeClient.h
diff --git a/Source/modules/serviceworkers/ServiceWorkerGlobalScopeClient.h b/Source/modules/serviceworkers/ServiceWorkerGlobalScopeClient.h
index f09504f01dee52c5e53b1680e1b7b89b70e5cd47..8512c00ee94b84d3da485fc2c916cb6999737951 100644
--- a/Source/modules/serviceworkers/ServiceWorkerGlobalScopeClient.h
+++ b/Source/modules/serviceworkers/ServiceWorkerGlobalScopeClient.h
@@ -34,7 +34,6 @@
 #include "core/dom/MessagePort.h"
 #include "core/workers/WorkerClients.h"
 #include "public/platform/WebMessagePortChannel.h"
-#include "public/platform/WebServiceWorkerClientFocusCallback.h"
 #include "public/platform/WebServiceWorkerClientsClaimCallbacks.h"
 #include "public/platform/WebServiceWorkerClientsInfo.h"
 #include "public/platform/WebServiceWorkerEventResult.h"
@@ -75,7 +74,6 @@ public:
     virtual void postMessageToCrossOriginClient(const WebCrossOriginServiceWorkerClient&, const WebString& message, PassOwnPtr<WebMessagePortChannelArray>) = 0;
     virtual void skipWaiting(WebServiceWorkerSkipWaitingCallbacks*) = 0;
     virtual void claim(WebServiceWorkerClientsClaimCallbacks*) = 0;
-    virtual void focus(int clientID, WebServiceWorkerClientFocusCallback*) = 0;
     virtual void focus(int clientID, WebServiceWorkerClientCallbacks*) = 0;
 
     static const char* supplementName();