Make all text buttons on download shelf work well with themes, not just

ui/views/controls/button/md_text_button.cc

Index: ui/views/controls/button/md_text_button.cc
diff --git a/ui/views/controls/button/md_text_button.cc b/ui/views/controls/button/md_text_button.cc
index 6b914ac5dbaa6f56bc2b0a869b85f1e53fb10548..7d160e840076334df11e440708e405af23118de2 100644
--- a/ui/views/controls/button/md_text_button.cc
+++ b/ui/views/controls/button/md_text_button.cc
@@ -78,6 +78,8 @@ MdTextButton* MdTextButton::Create(ButtonListener* listener,
   return button;
 }
 
+MdTextButton::~MdTextButton() {}
+
 void MdTextButton::SetProminent(bool is_prominent) {
   if (is_prominent_ == is_prominent)
     return;
@@ -209,8 +211,6 @@ MdTextButton::MdTextButton(ButtonListener* listener)
   layer()->SetFillsBoundsOpaquely(false);
 }
 
-MdTextButton::~MdTextButton() {}
-
 void MdTextButton::UpdatePadding() {
   // Don't use font-based padding when there's no text visible.
   if (GetText().empty()) {