From dbd9b6d728b1bc1407fbb9df85b809a1a79eec20 Mon Sep 17 00:00:00 2001
From: Sebastian Hengst <archaeopteryx@coole-files.de>
Date: Wed, 29 Mar 2017 01:18:22 +0200
Subject: [PATCH] Backed out changeset b6a97b374a6d (bug 1344839)

---
 widget/windows/nsWindow.cpp | 19 +++----------------
 1 file changed, 3 insertions(+), 16 deletions(-)

diff --git a/widget/windows/nsWindow.cpp b/widget/windows/nsWindow.cpp
index 78f89af2eb34..b31f70f361e4 100644
--- a/widget/windows/nsWindow.cpp
+++ b/widget/windows/nsWindow.cpp
@@ -3031,9 +3031,8 @@ nsWindow::SetCursor(imgIContainer* aCursor,
  *
  * SECTION: nsIWidget::Get/SetTransparencyMode
  *
- * Manage the transparency mode of the window containing this
- * widget. Only works for popup and dialog windows, and not
- * top-level windows.
+ * Manage the transparency mode of the top-level window
+ * containing this widget.
  *
  **************************************************************/
 
@@ -3045,19 +3044,7 @@ nsTransparencyMode nsWindow::GetTransparencyMode()
 
 void nsWindow::SetTransparencyMode(nsTransparencyMode aMode)
 {
-  nsWindow* window = GetTopLevelWindow(true);
-  MOZ_ASSERT(window);
-
-  if (!window || window->DestroyCalled()) {
-      return;
-  }
-
-  if (nsWindowType::eWindowType_toplevel == window->mWindowType) {
-      NS_WARNING("Cannot set transparency mode on top-level windows.");
-      return;
-  }
-
-  window->SetWindowTranslucencyInner(aMode);
+  GetTopLevelWindow(true)->SetWindowTranslucencyInner(aMode);
 }
 
 void nsWindow::UpdateOpaqueRegion(const LayoutDeviceIntRegion& aOpaqueRegion)