Implement ChromeViewsDelegate methods in terms of LayoutDelegate where possible.

ui/views/views_delegate.h

Index: ui/views/views_delegate.h
diff --git a/ui/views/views_delegate.h b/ui/views/views_delegate.h
index 950bb102b0a7d924084312f684696b2480bc37df..cbe34562bbe7024cf47130da99a1ee8d8e0f998b 100644
--- a/ui/views/views_delegate.h
+++ b/ui/views/views_delegate.h
@@ -199,21 +199,21 @@ class VIEWS_EXPORT ViewsDelegate {
   // Returns the insets that should be applied around a DialogClientView. Note
   // that the top inset is used for the distance between the buttons and the
   // DialogClientView's content view.
-  virtual gfx::Insets GetDialogButtonInsets();
+  virtual gfx::Insets GetDialogButtonInsets() const;
 
   // Returns the spacing between a pair of related horizontal buttons, used for
   // dialog layout.
-  virtual int GetDialogRelatedButtonHorizontalSpacing();
+  virtual int GetDialogRelatedButtonHorizontalSpacing() const;
 
   // Returns the spacing between a pair of related vertical controls, used for
   // dialog layout.
-  virtual int GetDialogRelatedControlVerticalSpacing();
+  virtual int GetDialogRelatedControlVerticalSpacing() const;
 
   // Returns the insets that should be applied around a dialog's frame view.
-  virtual gfx::Insets GetDialogFrameViewInsets();
+  virtual gfx::Insets GetDialogFrameViewInsets() const;
 
   // Returns the margins that should be applied around a bubble dialog.
-  virtual gfx::Insets GetBubbleDialogMargins();
+  virtual gfx::Insets GetBubbleDialogMargins() const;
 
  protected:
   ViewsDelegate();