[Mac][Material Design] Fix regression with infobar border.

chrome/browser/ui/cocoa/infobars/infobar_gradient_view.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.
 
 #include "chrome/browser/ui/cocoa/infobars/infobar_gradient_view.h"
 
 #include "base/mac/scoped_nsobject.h"
 #import "chrome/browser/themes/theme_properties.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #import "chrome/browser/ui/cocoa/infobars/infobar_container_controller.h"
@@ skipping 34 matching lines @@
       initWithStartingColor:skia::SkColorToCalibratedNSColor(topColor)
                 endingColor:skia::SkColorToCalibratedNSColor(bottomColor)]);
   [self setGradient:gradient];
 }
 
 - (NSColor*)strokeColor {
   const ui::ThemeProvider* themeProvider = [[self window] themeProvider];
   if (!themeProvider)
     return [NSColor blackColor];
 
-  if (!ui::MaterialDesignController::IsModeMaterial()) {
-    BOOL active = [[self window] isMainWindow];
-    return themeProvider->GetNSColor(
-        active ? ThemeProperties::COLOR_TOOLBAR_STROKE :
-                 ThemeProperties::COLOR_TOOLBAR_STROKE_INACTIVE);
-  }
+  BOOL active = [[self window] isMainWindow];
   return themeProvider->GetNSColor(
-             ThemeProperties::COLOR_DETACHED_BOOKMARK_BAR_SEPARATOR);
+      active ? ThemeProperties::COLOR_TOOLBAR_STROKE :
+               ThemeProperties::COLOR_TOOLBAR_STROKE_INACTIVE);
 }
 
 - (void)drawRect:(NSRect)rect {
   NSRect bounds = [self bounds];
   if (ui::MaterialDesignController::IsModeMaterial()) {
     bounds.size.height = InfoBarContainerDelegate::kDefaultBarTargetHeightMd;
   } else {
     bounds.size.height = InfoBarContainerDelegate::kDefaultBarTargetHeight;
   }
   CGFloat tipXOffset = arrowX_ - arrowHalfWidth_;
@@ skipping 72 matching lines @@
 }
 
 - (void)setHasTip:(BOOL)hasTip {
   if (hasTip_ == hasTip)
     return;
   hasTip_ = hasTip;
   [self setNeedsDisplay:YES];
 }
 
 @end