Delete panel metrics and define insets in terms of distance metrics.

chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc

Index: chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc
diff --git a/chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc b/chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc
index d8583a6d1055cc4a27303a52023c4aae0e6f7e19..e20b703e9f0ea9035694c3c6a42809a881352749 100644
--- a/chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc
+++ b/chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc
@@ -148,7 +148,8 @@ void MediaGalleriesDialogViews::InitChildViews() {
       header->SetHorizontalAlignment(gfx::ALIGN_LEFT);
       header->SetBorder(views::CreateEmptyBorder(
           vertical_padding,
-          provider->GetDistanceMetric(DISTANCE_PANEL_CONTENT_MARGIN),
+          provider->GetDistanceMetric(
+              views::DISTANCE_DIALOG_CONTENTS_VERTICAL_MARGIN),
           vertical_padding, 0));
       scroll_container->AddChildView(header);
     }