Move VideoRenderer out of Filter heirarchy.

media/base/mock_filters.cc

Index: media/base/mock_filters.cc
diff --git a/media/base/mock_filters.cc b/media/base/mock_filters.cc
index 4d43316d947a4100f0a610b1a562b0132e6df179..18ae4b1bbe5a5836c884423aa3de3f7642679b19 100644
--- a/media/base/mock_filters.cc
+++ b/media/base/mock_filters.cc
@@ -6,7 +6,6 @@
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
-#include "media/base/filter_host.h"
 
 using ::testing::_;
 using ::testing::Invoke;
@@ -85,14 +84,6 @@ scoped_ptr<FilterCollection> MockFilterCollection::Create() {
   return collection.Pass();
 }
 
-MockFilter::MockFilter() : host_(NULL) {}
-
-MockFilter::~MockFilter() {}
-
-void MockFilter::SetHost(FilterHost* host) {
-  host_ = host;
-}
-
 MockStatisticsCB::MockStatisticsCB() {}
 
 MockStatisticsCB::~MockStatisticsCB() {}