Pass implementation object to supplemental classes by reference

Source/web/LocalFileSystemClient.cpp

Index: Source/web/LocalFileSystemClient.cpp
diff --git a/Source/web/LocalFileSystemClient.cpp b/Source/web/LocalFileSystemClient.cpp
index 3280435a5089ebbea7db674f5bae5f87b8d25d6d..ccf07207046b2295f9f78ff04f470ad6710d4058 100644
--- a/Source/web/LocalFileSystemClient.cpp
+++ b/Source/web/LocalFileSystemClient.cpp
@@ -54,13 +54,14 @@ LocalFileSystemClient::~LocalFileSystemClient()
 
 bool LocalFileSystemClient::allowFileSystem(ExecutionContext* context)
 {
+    ASSERT(context);
     if (context->isDocument()) {
         Document* document = toDocument(context);
         WebFrameImpl* webFrame = WebFrameImpl::fromFrame(document->frame());
         return !webFrame->permissionClient() || webFrame->permissionClient()->allowFileSystem(webFrame);
     }
     ASSERT(context->isWorkerGlobalScope());
-    return WorkerPermissionClient::from(toWorkerGlobalScope(context))->allowFileSystem();
+    return WorkerPermissionClient::from(*toWorkerGlobalScope(context))->allowFileSystem();
 }
 
 LocalFileSystemClient::LocalFileSystemClient()