Revert of cc: Add occlusion checker as a fixed view of occlusion tracker.

cc/resources/picture_layer_tiling.h

Index: cc/resources/picture_layer_tiling.h
diff --git a/cc/resources/picture_layer_tiling.h b/cc/resources/picture_layer_tiling.h
index e3fffeefd5e4fac0e2d0b5b0ef608d543db8a676..35bbf94a297847aa6122f1d870bccb603ae092bb 100644
--- a/cc/resources/picture_layer_tiling.h
+++ b/cc/resources/picture_layer_tiling.h
@@ -17,7 +17,6 @@
 #include "cc/base/tiling_data.h"
 #include "cc/resources/tile.h"
 #include "cc/resources/tile_priority.h"
-#include "cc/trees/occlusion.h"
 #include "ui/gfx/rect.h"
 
 namespace base {
@@ -28,6 +27,8 @@
 
 namespace cc {
 
+template <typename LayerType>
+class OcclusionTracker;
 class PictureLayerTiling;
 class PicturePileImpl;
 
@@ -236,11 +237,14 @@
 
   void Reset();
 
-  void UpdateTilePriorities(WhichTree tree,
-                            const gfx::Rect& visible_layer_rect,
-                            float ideal_contents_scale,
-                            double current_frame_time_in_seconds,
-                            const Occlusion& occlusion_in_layer_space);
+  void UpdateTilePriorities(
+      WhichTree tree,
+      const gfx::Rect& visible_layer_rect,
+      float ideal_contents_scale,
+      double current_frame_time_in_seconds,
+      const OcclusionTracker<LayerImpl>* occlusion_tracker,
+      const LayerImpl* render_target,
+      const gfx::Transform& draw_transform);
 
   // Copies the src_tree priority into the dst_tree priority for all tiles.
   // The src_tree priority is reset to the lowest priority possible.  This