Fix the toolbar bottom border being 2 pixels w/ a detached bookmark bar.

chrome/browser/ui/views/frame/browser_view.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/views/frame/browser_view.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 219 matching lines @@
                    tp->GetColor(ThemeProperties::COLOR_CONTROL_BACKGROUND));
   canvas->FillRect(
       fill_rect,
       tp->GetColor(ThemeProperties::COLOR_DETACHED_BOOKMARK_BAR_BACKGROUND));
 
   // Draw the separators above and below bookmark bar;
   // if animating, these are fading in/out.
   SkColor separator_color =
       tp->GetColor(ThemeProperties::COLOR_DETACHED_BOOKMARK_BAR_SEPARATOR);
 
-  if (ui::MaterialDesignController::IsModeMaterial()) {
-    BrowserView::Paint1pxHorizontalLine(
-        canvas, separator_color,
-        gfx::Rect(0, 0, view->width(),
-                  views::NonClientFrameView::kClientEdgeThickness),
-        true);
-  } else {
+  // In material mode the toolbar bottom stroke serves as our top stroke.
+  if (!ui::MaterialDesignController::IsModeMaterial())
     PaintHorizontalBorder(canvas, view, true, separator_color);
-  }
 
   // For the bottom separator, increase the luminance. Either double it or halve
   // the distance to 1.0, whichever is less of a difference.
   color_utils::HSL hsl;
   color_utils::SkColorToHSL(separator_color, &hsl);
   hsl.l = std::min((hsl.l + 1) / 2, hsl.l * 2);
   BrowserView::Paint1pxHorizontalLine(
       canvas, color_utils::HSLToSkColor(hsl, SK_AlphaOPAQUE),
       view->GetLocalBounds(), true);
 }
@@ skipping 2403 matching lines @@
 }
 
 extensions::ActiveTabPermissionGranter*
 BrowserView::GetActiveTabPermissionGranter() {
   content::WebContents* web_contents = GetActiveWebContents();
   if (!web_contents)
     return nullptr;
   return extensions::TabHelper::FromWebContents(web_contents)
       ->active_tab_permission_granter();
 }