Refactor ViewsDelegate and MD-ify the icon-to-text spacing for checkbox and radiobutton

chrome/browser/ui/views/chrome_views_delegate_win.cc

Index: chrome/browser/ui/views/chrome_views_delegate_win.cc
diff --git a/chrome/browser/ui/views/chrome_views_delegate_win.cc b/chrome/browser/ui/views/chrome_views_delegate_win.cc
index 342e1391cac54a2b465e5cd0a15ff5c5bb3c0b04..475bede05671fadfe664cec16993512238ca9b2b 100644
--- a/chrome/browser/ui/views/chrome_views_delegate_win.cc
+++ b/chrome/browser/ui/views/chrome_views_delegate_win.cc
@@ -104,10 +104,26 @@ int GetAppbarAutohideEdgesOnWorkerThread(HMONITOR monitor) {
   return edges;
 }
 
+ChromeViewsDelegate* views_delegate = nullptr;
+
 }  // namespace
 
 ChromeViewsDelegate::ChromeViewsDelegate()
-    : in_autohide_edges_callback_(false), weak_factory_(this) {}
+    : in_autohide_edges_callback_(false), weak_factory_(this) {
+  DCHECK(!views_delegate);
+  views_delegate = this;
+}
+
+ChromeViewsDelegate::~ChromeViewsDelegate() {
+  DCHECK_EQ(0u, ref_count_);
+
+  DCHECK_EQ(this, views_delegate);
+  views_delegate = nullptr;
+}
+
+ChromeViewsDelegate* ChromeViewsDelegate::GetInstance() {
+  return views_delegate;
+}
 
 HICON ChromeViewsDelegate::GetDefaultWindowIcon() const {
   return GetAppIcon();