Remove limit on number of resources in cc

cc/resources/tile_manager.h

Index: cc/resources/tile_manager.h
diff --git a/cc/resources/tile_manager.h b/cc/resources/tile_manager.h
index 6f579f9fb1c9dde8baa82cd233604482f0e00f5f..8b7c65f26f66abc183e344abdb72b3b56f3f93e9 100644
--- a/cc/resources/tile_manager.h
+++ b/cc/resources/tile_manager.h
@@ -188,10 +188,11 @@ class CC_EXPORT TileManager : public RasterizerClient,
   void AssignGpuMemoryToTiles(TileVector* tiles_that_need_to_be_rasterized);
 
  private:
+  // TODO(boliu): Replace with int64?
   class MemoryUsage {
    public:
     MemoryUsage();
-    MemoryUsage(int64 memory_bytes, int resource_count);
+    explicit MemoryUsage(int64 memory_bytes);
 
     static MemoryUsage FromConfig(const gfx::Size& size, ResourceFormat format);
     static MemoryUsage FromTile(const Tile* tile);
@@ -205,7 +206,6 @@ class CC_EXPORT TileManager : public RasterizerClient,
 
    private:
     int64 memory_bytes_;
-    int resource_count_;
   };
 
   void OnImageDecodeTaskCompleted(int layer_id,