Replace many skia::RefPtr with sk_sp<> in cc/

cc/animation/animation_player.cc

Index: cc/animation/animation_player.cc
diff --git a/cc/animation/animation_player.cc b/cc/animation/animation_player.cc
index 698c6ed2e1e6f9bc071a7001cb26bf3980057ee0..b96d5781ed832172246c189bec39e1de3a00e0f4 100644
--- a/cc/animation/animation_player.cc
+++ b/cc/animation/animation_player.cc
@@ -4,6 +4,8 @@
 
 #include "cc/animation/animation_player.h"
 
+#include <algorithm>

[danakj, 2016/04/25 22:06:23]

rebase error? this is the only change in this file

[tomhudson, 2016/04/27 12:06:47]

I'm assuming it was getting this header via some magic, because without it my
build fails like so:

../../cc/animation/animation_player.cc:145:38: error: no member named
'remove_if' in namespace 'std'
    auto animations_to_remove = std::remove_if(
                                ~~~~~^
../../cc/animation/animation_player.cc:166:38: error: no member named
'remove_if' in namespace 'std'
    auto animations_to_remove = std::remove_if(

+
 #include "cc/animation/animation_delegate.h"
 #include "cc/animation/animation_host.h"
 #include "cc/animation/animation_timeline.h"