Remove all uses of skia::RefPtr and stale includes

cc/test/fake_raster_source.h

Index: cc/test/fake_raster_source.h
diff --git a/cc/test/fake_raster_source.h b/cc/test/fake_raster_source.h
index e347e5c9efe470d883fa4b471d844094f7e1590d..bbb2b97d3464a5399b3881e1a1f39f0a475148a0 100644
--- a/cc/test/fake_raster_source.h
+++ b/cc/test/fake_raster_source.h
@@ -7,10 +7,11 @@
 
 #include "base/memory/ref_counted.h"
 #include "cc/playback/raster_source.h"
-#include "third_party/skia/include/core/SkCanvas.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 
+class SkCanvas;
+
 namespace cc {
 
 class RecordingSource;