Make normal MD text buttons *on infobars* white.

chrome/browser/ui/views/infobars/infobar_view.h

Index: chrome/browser/ui/views/infobars/infobar_view.h
diff --git a/chrome/browser/ui/views/infobars/infobar_view.h b/chrome/browser/ui/views/infobars/infobar_view.h
index 281899aae32e08b5c5c4a850c32b176961914c80..468648993344fa99d7f228506f02b049951129cb 100644
--- a/chrome/browser/ui/views/infobars/infobar_view.h
+++ b/chrome/browser/ui/views/infobars/infobar_view.h
@@ -48,6 +48,7 @@ class InfoBarView : public infobars::InfoBar,
 
   static const int kButtonButtonSpacing;
   static const int kEndOfLabelSpacing;
+  static const SkColor kTextColor;
 
   ~InfoBarView() override;
 
@@ -64,10 +65,6 @@ class InfoBarView : public infobars::InfoBar,
   // NOTE: Subclasses must ignore button presses if we're unowned.
   static views::LabelButton* CreateTextButton(views::ButtonListener* listener,
                                               const base::string16& text);
-  // As above, but used for MD.
-  static views::MdTextButton* CreateMdTextButton(
-      views::ButtonListener* listener,
-      const base::string16& text);
 
   // Given |labels| and the total |available_width| to display them in, sets
   // each label's size so that the longest label shrinks until it reaches the