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

chrome/browser/ui/views/chrome_views_delegate.h

Index: chrome/browser/ui/views/chrome_views_delegate.h
diff --git a/chrome/browser/ui/views/chrome_views_delegate.h b/chrome/browser/ui/views/chrome_views_delegate.h
index 5e0bc98096fc2494da7492940834023c48b599f8..c8e930111924977750e37034daaaae011769bb50 100644
--- a/chrome/browser/ui/views/chrome_views_delegate.h
+++ b/chrome/browser/ui/views/chrome_views_delegate.h
@@ -20,6 +20,8 @@ class ChromeViewsDelegate : public views::ViewsDelegate {
   ChromeViewsDelegate();
   ~ChromeViewsDelegate() override;
 
+  static ChromeViewsDelegate* GetInstance();
+
   // views::ViewsDelegate:
   void SaveWindowPlacement(const views::Widget* window,
                            const std::string& window_name,
@@ -58,15 +60,10 @@ class ChromeViewsDelegate : public views::ViewsDelegate {
   std::string GetApplicationName() override;
   scoped_refptr<base::TaskRunner> GetBlockingPoolTaskRunner() override;
 
-  gfx::Insets GetDialogButtonInsets() const override;
-  int GetDialogCloseButtonMargin() const override;
-  int GetDialogRelatedButtonHorizontalSpacing() const override;
-  int GetDialogRelatedControlVerticalSpacing() const override;
-  gfx::Insets GetDialogFrameViewInsets() const override;
-  gfx::Insets GetBubbleDialogMargins() const override;
-  int GetButtonMinimumWidth() const override;
-  int GetDialogButtonMinimumWidth() const override;
-  int GetButtonHorizontalPadding() const override;
+  gfx::Insets GetInsetsMetric(views::InsetsMetric metric) const override;
+  int GetSpacingMetric(views::SpacingMetric metric) const override;
+
+  int GetDefaultSpacingMetric(views::SpacingMetric metric) const;
 
  private:
 #if defined(OS_WIN)