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

chrome/browser/ui/views/desktop_capture/desktop_media_picker_views.cc

Index: chrome/browser/ui/views/desktop_capture/desktop_media_picker_views.cc
diff --git a/chrome/browser/ui/views/desktop_capture/desktop_media_picker_views.cc b/chrome/browser/ui/views/desktop_capture/desktop_media_picker_views.cc
index 4176b2a68abb08f65aae4bef6d6437f0b8282276..6c6a275434a0028f86c71a6a1bb6bbec6aa76b3e 100644
--- a/chrome/browser/ui/views/desktop_capture/desktop_media_picker_views.cc
+++ b/chrome/browser/ui/views/desktop_capture/desktop_media_picker_views.cc
@@ -65,11 +65,14 @@ DesktopMediaPickerDialogView::DesktopMediaPickerDialogView(
       description_label_(new views::Label()),
       audio_share_checkbox_(nullptr),
       pane_(new views::TabbedPane()) {
+  const ChromeLayoutProvider* provider = ChromeLayoutProvider::Get();
   SetLayoutManager(new views::BoxLayout(
-      views::BoxLayout::kVertical, views::kButtonHEdgeMarginNew,
-      ChromeLayoutProvider::Get()->GetDistanceMetric(
-          DISTANCE_PANEL_CONTENT_MARGIN),
-      views::kLabelToControlVerticalSpacing));
+      views::BoxLayout::kVertical,
+      provider->GetDistanceMetric(
+          views::DISTANCE_DIALOG_CONTENTS_HORIZONTAL_MARGIN),
+      provider->GetDistanceMetric(
+          views::DISTANCE_DIALOG_CONTENTS_VERTICAL_MARGIN),
+      provider->GetDistanceMetric(DISTANCE_RELATED_CONTROL_HORIZONTAL_SMALL)));

[Peter Kasting, 2017/05/18 00:00:06]

This doesn't seem right, you've gone from a vertical constant to a horizontal
one (in a vertical context, which seems wrong).

[Bret, 2017/05/18 00:50:05]

Oops, done.

 
   description_label_->SetMultiLine(true);
   description_label_->SetHorizontalAlignment(gfx::ALIGN_LEFT);