Change name of NativeTheme::instance() to make it clear it's web only.

ui/views/controls/label.cc

Index: ui/views/controls/label.cc
diff --git a/ui/views/controls/label.cc b/ui/views/controls/label.cc
index 43dafe649e284f35b120ab103e40be2ff39cb952..ddafe4c212971aeaf54ec54e2af73283502285b0 100644
--- a/ui/views/controls/label.cc
+++ b/ui/views/controls/label.cc
@@ -404,7 +404,6 @@ void Label::Init(const base::string16& text, const gfx::FontList& font_list) {
   subpixel_rendering_enabled_ = true;
   auto_color_readability_ = true;
   multi_line_ = false;
-  UpdateColorsFromTheme(ui::NativeTheme::instance());
   handles_tooltips_ = true;
   collapse_when_hidden_ = false;
   max_width_ = 0;