Move some class-scope constants to file-scope in the lone subclass using them.

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

Index: chrome/browser/ui/views/infobars/infobar_view.cc
diff --git a/chrome/browser/ui/views/infobars/infobar_view.cc b/chrome/browser/ui/views/infobars/infobar_view.cc
index 5fffc58b068e03886feebcc6a04be3df5964c0e5..fd3330137586e1005672c9fb01f6b82ae7a75cbc 100644
--- a/chrome/browser/ui/views/infobars/infobar_view.cc
+++ b/chrome/browser/ui/views/infobars/infobar_view.cc
@@ -62,11 +62,6 @@ constexpr SkColor GetInfobarTextColor() {
 
 // InfoBarView ----------------------------------------------------------------
 
-// static
-const int InfoBarView::kButtonButtonSpacing = views::kRelatedButtonHSpacing;
-const int InfoBarView::kEndOfLabelSpacing = views::kItemLabelSpacing;
-const SkColor InfoBarView::kTextColor = GetInfobarTextColor();
-
 InfoBarView::InfoBarView(std::unique_ptr<infobars::InfoBarDelegate> delegate)
     : infobars::InfoBar(std::move(delegate)),
       views::ExternalFocusTracker(this, nullptr),