Implement ChromeViewsDelegate methods in terms of LayoutDelegate where possible.

ui/views/views_delegate.cc

Index: ui/views/views_delegate.cc
diff --git a/ui/views/views_delegate.cc b/ui/views/views_delegate.cc
index 3481102f57fc5b07d74b53e347a18b2fa12bb31d..e7fa2be2b1ce36eee7bed1d899863246dc791936 100644
--- a/ui/views/views_delegate.cc
+++ b/ui/views/views_delegate.cc
@@ -126,25 +126,25 @@ scoped_refptr<base::TaskRunner> ViewsDelegate::GetBlockingPoolTaskRunner() {
   return nullptr;
 }
 
-gfx::Insets ViewsDelegate::GetDialogButtonInsets() {
+gfx::Insets ViewsDelegate::GetDialogButtonInsets() const {
   return gfx::Insets(0, kButtonHEdgeMarginNew, kButtonVEdgeMarginNew,
                      kButtonHEdgeMarginNew);
 }
 
-int ViewsDelegate::GetDialogRelatedButtonHorizontalSpacing() {
+int ViewsDelegate::GetDialogRelatedButtonHorizontalSpacing() const {
   return kRelatedButtonHSpacing;
 }
 
-int ViewsDelegate::GetDialogRelatedControlVerticalSpacing() {
+int ViewsDelegate::GetDialogRelatedControlVerticalSpacing() const {
   return kRelatedControlVerticalSpacing;
 }
 
-gfx::Insets ViewsDelegate::GetDialogFrameViewInsets() {
+gfx::Insets ViewsDelegate::GetDialogFrameViewInsets() const {
   return gfx::Insets(kPanelVertMargin, kButtonHEdgeMarginNew, 0,
                      kButtonHEdgeMarginNew);
 }
 
-gfx::Insets ViewsDelegate::GetBubbleDialogMargins() {
+gfx::Insets ViewsDelegate::GetBubbleDialogMargins() const {
   return gfx::Insets(kPanelVertMargin, kPanelHorizMargin);
 }