[Mac][Material Design] Update toolbar bottom border color.

chrome/browser/ui/cocoa/download/download_shelf_view_cocoa.mm

 // Copyright (c) 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.
 
 #import "chrome/browser/ui/cocoa/download/download_shelf_view_cocoa.h"
 
 #include "chrome/browser/themes/theme_properties.h"
 #include "chrome/browser/themes/theme_service.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_strip_controller.h"
 #import "chrome/browser/ui/cocoa/view_id_util.h"
 #import "ui/base/cocoa/nsview_additions.h"
+#include "ui/base/material_design/material_design_controller.h"
 
 @implementation DownloadShelfView
 
 // For programmatic instantiations in unit tests.
 - (id)initWithFrame:(NSRect)frameRect {
   if ((self = [super initWithFrame:frameRect])) {
     [self setShowsDivider:NO];
   }
   return self;
 }
 
 // For nib instantiations in production.
 - (id)initWithCoder:(NSCoder*)decoder {
   if ((self = [super initWithCoder:decoder])) {
     [self setShowsDivider:NO];
   }
   return self;
 }
 
 - (NSColor*)strokeColor {
-  BOOL isActive = [[self window] isMainWindow];
   const ui::ThemeProvider* themeProvider = [[self window] themeProvider];
-  return themeProvider ? themeProvider->GetNSColor(
-      isActive ? ThemeProperties::COLOR_TOOLBAR_STROKE :
-                 ThemeProperties::COLOR_TOOLBAR_STROKE_INACTIVE) :
-      [NSColor blackColor];
+  if (!themeProvider) {
+    return [NSColor blackColor];
+  }
+  if (!ui::MaterialDesignController::IsModeMaterial()) {
+    BOOL isActive = [[self window] isMainWindow];
+    return themeProvider->GetNSColor(
+        isActive ? ThemeProperties::COLOR_TOOLBAR_STROKE :
+                   ThemeProperties::COLOR_TOOLBAR_STROKE_INACTIVE);
+  }
+  return themeProvider->GetNSColor(
+             ThemeProperties::COLOR_DETACHED_BOOKMARK_BAR_SEPARATOR);
 }
 
 - (NSPoint)patternPhase {
   // We want our backgrounds for the shelf to be phased from the upper
   // left hand corner of the view. Offset it by tab height so that the
   // background matches the toolbar background.
   return NSMakePoint(
       0, NSHeight([self bounds]) + [TabStripController defaultTabHeight]);
 }
 
@@ skipping 36 matching lines @@
 
 - (ViewID)viewID {
   return VIEW_ID_DOWNLOAD_SHELF;
 }
 
 - (BOOL)isOpaque {
   return YES;
 }
 
 @end