Use the native frame for the task manager on Linux Aura

chrome/browser/ui/views/apps/chrome_native_app_window_views.cc

Index: chrome/browser/ui/views/apps/chrome_native_app_window_views.cc
diff --git a/chrome/browser/ui/views/apps/chrome_native_app_window_views.cc b/chrome/browser/ui/views/apps/chrome_native_app_window_views.cc
index 1be2fd95de452510369ec9e0549937ae1673ef92..bab33391cf34134cfff6156f6c8607c4da16c653 100644
--- a/chrome/browser/ui/views/apps/chrome_native_app_window_views.cc
+++ b/chrome/browser/ui/views/apps/chrome_native_app_window_views.cc
@@ -553,15 +553,8 @@ views::NonClientFrameView* ChromeNativeAppWindowViews::CreateNonClientFrameView(
     return custom_frame_view;
   }
 #endif
-#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
-  // Linux always uses the non standard frame view because the OS draws the
-  // frame (if a frame is needed).
-  return CreateNonStandardAppFrame();
-#else
-  if (IsFrameless() || has_frame_color_)
-    return CreateNonStandardAppFrame();
-#endif
-  return CreateStandardDesktopAppFrame();
+  return (IsFrameless() || has_frame_color_) ?
+      CreateNonStandardAppFrame() : CreateStandardDesktopAppFrame();
 }
 
 bool ChromeNativeAppWindowViews::WidgetHasHitTestMask() const {