cc: Don't discard tiles unless memory is low

cc/tile_manager.cc

Index: cc/tile_manager.cc
diff --git a/cc/tile_manager.cc b/cc/tile_manager.cc
index f4bf32b7c073e8c298cab9f22c49f82195964b6b..d1ae2f357ffe281fbed5b4322f2e4e8492f919df 100644
--- a/cc/tile_manager.cc
+++ b/cc/tile_manager.cc
@@ -48,11 +48,6 @@ inline TileManagerBin BinFromTilePriority(const TilePriority& prio) {
   const double prepainting_window_time_seconds = 1.0;
   const double backfling_guard_distance_pixels = 314.0;
 
-  // Explicitly limit how far ahead we will prepaint to limit memory usage.
-  if (prio.distance_to_visible_in_pixels >
-      TilePriority::kMaxDistanceInContentSpace)
-    return NEVER_BIN;
-
   if (prio.time_to_visible_in_seconds == 0 ||
       prio.distance_to_visible_in_pixels < backfling_guard_distance_pixels)
     return NOW_BIN;