Introduce media::RendererFactory interface.

content/public/renderer/content_renderer_client.cc

Index: content/public/renderer/content_renderer_client.cc
diff --git a/content/public/renderer/content_renderer_client.cc b/content/public/renderer/content_renderer_client.cc
index c4df6402ad272e87c0a32b219022687dcb69e380..9617ccbc7840bade2deb63c06fd189c8a230f565 100644
--- a/content/public/renderer/content_renderer_client.cc
+++ b/content/public/renderer/content_renderer_client.cc
@@ -4,7 +4,7 @@
 
 #include "content/public/renderer/content_renderer_client.h"
 
-#include "media/base/renderer.h"
+#include "media/base/renderer_factory.h"
 #include "third_party/WebKit/public/web/WebPluginPlaceholder.h"
 
 namespace content {
@@ -169,10 +169,9 @@ void ContentRendererClient::AddKeySystems(
     std::vector<media::KeySystemInfo>* key_systems) {
 }
 
-scoped_ptr<media::Renderer> ContentRendererClient::CreateMediaRenderer(
-    RenderFrame* render_frame,
-    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner) {
-  return scoped_ptr<media::Renderer>();
+scoped_ptr<media::RendererFactory>
+ContentRendererClient::CreateMediaRendererFactory(RenderFrame* render_frame) {
+  return nullptr;
 }
 
 bool ContentRendererClient::ShouldReportDetailedMessageForSource(