ServiceWorker: Implement navigate() method in WindowClient (blink side).

Source/web/ServiceWorkerGlobalScopeClientImpl.cpp

Index: Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
diff --git a/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp b/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
index 36c0ed46d0d4248adfe79a384ff79e9a41ab39b4..0c242a023c4755ad79a452480f5fad84676e7d91 100644
--- a/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
+++ b/Source/web/ServiceWorkerGlobalScopeClientImpl.cpp
@@ -138,6 +138,11 @@ void ServiceWorkerGlobalScopeClientImpl::focus(const WebString& clientUUID, WebS
     m_client.focus(clientUUID, callback);
 }
 
+void ServiceWorkerGlobalScopeClientImpl::navigate(const WebString& clientUUID, const WebURL& url, WebServiceWorkerClientCallbacks* callback)
+{
+    m_client.navigate(clientUUID, url, callback);
+}
+
 void ServiceWorkerGlobalScopeClientImpl::stashMessagePort(WebMessagePortChannel* channel, const WebString& name)
 {
     m_client.stashMessagePort(channel, name);