Remove a bunch of pre-MD toolbar code and assets.

chrome/browser/themes/theme_properties.h

Index: chrome/browser/themes/theme_properties.h
diff --git a/chrome/browser/themes/theme_properties.h b/chrome/browser/themes/theme_properties.h
index 83c719cb0beb2d235c08d4510a76d48e1819c267..7bc6709d6e05582e0d40b9bc826333387d68da42 100644
--- a/chrome/browser/themes/theme_properties.h
+++ b/chrome/browser/themes/theme_properties.h
@@ -173,10 +173,6 @@ class ThemeProperties {
   // generate a CSS value.
   static std::string TilingToString(int tiling);
 
-  // Returns the set of IDR_* resources that should be tinted.
-  // This method is not thread safe.
-  static const std::set<int>& GetTintableToolbarButtons();
-
   // Returns the default tint for the given tint |id| TINT_* enum value.
   // Returns an HSL value of {-1, -1, -1} if |id| is invalid.
   static color_utils::HSL GetDefaultTint(int id, bool otr);