CC: Delete unused code and fix priority_ array definition.

cc/resources/tile_manager.cc

Index: cc/resources/tile_manager.cc
diff --git a/cc/resources/tile_manager.cc b/cc/resources/tile_manager.cc
index 3e91167866031a18cb3c342f37f4f1fa4c9d3c1b..46b785d97539f2cf2c7f7703b5564abeb25eaf24 100644
--- a/cc/resources/tile_manager.cc
+++ b/cc/resources/tile_manager.cc
@@ -149,7 +149,6 @@ TileManager::TileManager(
       prioritized_tiles_dirty_(false),
       all_tiles_that_need_to_be_rasterized_have_memory_(true),
       all_tiles_required_for_activation_have_memory_(true),
-      all_tiles_required_for_activation_have_been_initialized_(true),
       bytes_releasable_(0),
       resources_releasable_(0),
       ever_exceeded_memory_budget_(false),
@@ -497,7 +496,6 @@ void TileManager::AssignGpuMemoryToTiles(
   // the needs-to-be-rasterized queue.
   all_tiles_that_need_to_be_rasterized_have_memory_ = true;
   all_tiles_required_for_activation_have_memory_ = true;
-  all_tiles_required_for_activation_have_been_initialized_ = true;
 
   // Cast to prevent overflow.
   int64 bytes_available =
@@ -587,9 +585,6 @@ void TileManager::AssignGpuMemoryToTiles(
 
     DCHECK(!tile_version.resource_);
 
-    if (tile->required_for_activation())
-      all_tiles_required_for_activation_have_been_initialized_ = false;
-
     // Tile shouldn't be rasterized if |tiles_that_need_to_be_rasterized|
     // has reached it's limit or we've failed to assign gpu memory to this
     // or any higher priority tile. Preventing tiles that fit into memory