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 ccb8210295d55aaa18a16d6a95938c95f46aadec..9f92e8ea9c4f46303bda1361ec7850d7b2bc43d2 100644
--- a/chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc
+++ b/chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc
@@ -150,7 +150,8 @@ 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);
     }