Make the RenderViewHostFactory a global. This prevents us from having to pass...

chrome/browser/renderer_host/render_view_host_factory.cc

+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/renderer_host/render_view_host_factory.h"
+
+#include "base/logging.h"
+#include "chrome/browser/renderer_host/render_view_host.h"
+
+// static
+RenderViewHostFactory* RenderViewHostFactory::factory_ = NULL;
+
+// static
+RenderViewHost* RenderViewHostFactory::Create(
+    SiteInstance* instance,
+    RenderViewHostDelegate* delegate,
+    int routing_id,
+    base::WaitableEvent* modal_dialog_event) {
+  if (factory_) {
+    return factory_->CreateRenderViewHost(instance, delegate,
+                                          routing_id, modal_dialog_event);
+  }
+  return new RenderViewHost(instance, delegate, routing_id, modal_dialog_event);
+}
+
+// static
+void RenderViewHostFactory::RegisterFactory(RenderViewHostFactory* factory) {
+  DCHECK(!factory_) << "Can't register two factories at once.";
+  factory_ = factory;
+}
+
+// static
+void RenderViewHostFactory::UnregisterFactory() {
+  DCHECK(factory_) << "No factory to unregister.";
+  factory_ = NULL;
+}