cocoa browser: remove remaining non-MD code

chrome/browser/ui/cocoa/background_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/background_gradient_view.h"
 
 #import "chrome/browser/themes/theme_properties.h"
 #import "chrome/browser/themes/theme_service.h"
 #import "chrome/browser/ui/cocoa/themed_window.h"
 #include "chrome/grit/theme_resources.h"
@@ skipping 76 matching lines @@
 - (NSColor*)strokeColor {
   NSWindow* window = [self window];
 
   // Some views have a child NSWindow between them and the window that is
   // active (e.g, OmniboxPopupTopSeparatorView). For these, check the status
   // of parentWindow instead. Note that this is not tracked correctly (but
   // the views that do this appear to be removed when the window loses focus
   // anyway).
   if ([window parentWindow])
     window = [window parentWindow];
-  BOOL isActive = [window isMainWindow];
 
   const ui::ThemeProvider* themeProvider = [window themeProvider];
   if (!themeProvider)
     return [NSColor blackColor];
-  if (!ui::MaterialDesignController::IsModeMaterial()) {
-    return themeProvider->GetNSColor(
-        isActive ? ThemeProperties::COLOR_TOOLBAR_STROKE :
-                   ThemeProperties::COLOR_TOOLBAR_STROKE_INACTIVE);
-  }
   return themeProvider->GetNSColor(
              ThemeProperties::COLOR_DETACHED_BOOKMARK_BAR_SEPARATOR);
 }
 
 - (NSColor*)backgroundImageColor {
   const ui::ThemeProvider* themeProvider = [[self window] themeProvider];
   if (!themeProvider)
     return [[self window] backgroundColor];
 
   // Themes don't have an inactive image so only look for one if there's no
@@ skipping 62 matching lines @@
 
 - (void)windowDidChangeTheme {
   [self setNeedsDisplay:YES];
 }
 
 - (void)windowDidChangeActive {
   [self setNeedsDisplay:YES];
 }
 
 @end