From 2ee8142136c93f4edd66ff0f329566802a7821c3 Mon Sep 17 00:00:00 2001
From: Cheng Zhao <zcbenz@gmail.com>
Date: Tue, 12 Jul 2016 15:01:37 +0900
Subject: [PATCH] Fix transparent window having border on OS X 10.9

---
 atom/browser/native_window_mac.mm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/atom/browser/native_window_mac.mm b/atom/browser/native_window_mac.mm
index 7d627208a5a3..14ac3e73142b 100644
--- a/atom/browser/native_window_mac.mm
+++ b/atom/browser/native_window_mac.mm
@@ -1082,7 +1082,10 @@ void NativeWindowMac::UpdateDraggableRegions(
 
 void NativeWindowMac::InstallView() {
   // Make sure the bottom corner is rounded: http://crbug.com/396264.
-  [[window_ contentView] setWantsLayer:YES];
+  // But do not enable it on OS X 10.9 for transparent window, otherwise a
+  // semi-transparent frame would show.
+  if (!(transparent() && base::mac::IsOSMavericks()))
+    [[window_ contentView] setWantsLayer:YES];
 
   NSView* view = inspectable_web_contents()->GetView()->GetNativeView();
   if (has_frame()) {