message: Remove explicit keyword
diff: @@ -54,8 +54,7 @@ class LayoutItem {
  // Prevent creation of uninitialized LayoutItem
  LayoutItem() = delete;
  - explicit LayoutItem(LayoutType type, int spacing, bool must_wrap,
  - int indentation = 0)
  + LayoutItem(LayoutType type, int spacing, bool must_wrap, int indentation = 0)
  : type_(type),
  indentation_(indentation),
  spaces_before_(spacing),
  