cc: Start using raster/eviction iterators in tile manager

cc/resources/tile.cc

Index: cc/resources/tile.cc
diff --git a/cc/resources/tile.cc b/cc/resources/tile.cc
index d59dc029ccc1ca88b0160f3ded59c245a25d5e40..16252ede5b4f1bf6e20e99b52c4be8662e110db8 100644
--- a/cc/resources/tile.cc
+++ b/cc/resources/tile.cc
@@ -25,7 +25,6 @@ Tile::Tile(TileManager* tile_manager,
            int source_frame_number,
            int flags)
     : RefCountedManaged<Tile>(tile_manager),
-      tile_manager_(tile_manager),
       tile_size_(tile_size),
       content_rect_(content_rect),
       contents_scale_(contents_scale),
@@ -44,19 +43,11 @@ Tile::~Tile() {
 }
 
 void Tile::SetPriority(WhichTree tree, const TilePriority& priority) {
-  if (priority == priority_[tree])
-    return;
-
   priority_[tree] = priority;
-  tile_manager_->DidChangeTilePriority(this);
 }
 
 void Tile::MarkRequiredForActivation() {
-  if (priority_[PENDING_TREE].required_for_activation)
-    return;
-
   priority_[PENDING_TREE].required_for_activation = true;
-  tile_manager_->DidChangeTilePriority(this);
 }
 
 scoped_ptr<base::Value> Tile::AsValue() const {