cc: Fix BytesPerPixel issue and refactor.

cc/tiles/tile_manager.cc

Index: cc/tiles/tile_manager.cc
diff --git a/cc/tiles/tile_manager.cc b/cc/tiles/tile_manager.cc
index de3601a3dfdf696de33c20bc59711626d40e694d..201ce5d74ef52e9b7df731d22c18b3c7916992fb 100644
--- a/cc/tiles/tile_manager.cc
+++ b/cc/tiles/tile_manager.cc
@@ -1025,9 +1025,9 @@ TileManager::MemoryUsage::MemoryUsage(size_t memory_bytes,
 TileManager::MemoryUsage TileManager::MemoryUsage::FromConfig(
     const gfx::Size& size,
     ResourceFormat format) {
-  // We can use UncheckedMemorySizeBytes here since this is used with a tile
+  // We can use SizeInBytes here since this is used with a tile
   // size which is determined by the compositor (it's at most max texture size).
-  return MemoryUsage(Resource::UncheckedMemorySizeBytes(size, format), 1);
+  return MemoryUsage(ResourceUtil::SizeInBytes(size, format), 1);
 }
 
 // static