Render opaque border with no shadow for web contents modal dialogs under Views/Win32

ui/views/window/dialog_delegate.cc

Index: ui/views/window/dialog_delegate.cc
diff --git a/ui/views/window/dialog_delegate.cc b/ui/views/window/dialog_delegate.cc
index a6f2732c388135ed834a6f388f69402992857f01..e1272d1e81358e4d8e93cbacfb0172963f43abb1 100644
--- a/ui/views/window/dialog_delegate.cc
+++ b/ui/views/window/dialog_delegate.cc
@@ -152,11 +152,25 @@ NonClientFrameView* DialogDelegate::CreateNonClientFrameView(Widget* widget) {
 
 // static
 NonClientFrameView* DialogDelegate::CreateNewStyleFrameView(Widget* widget) {
+  return CreateNewStyleFrameView(widget, false);
+}
+
+NonClientFrameView* DialogDelegate::CreateNewStyleFrameView(
+    Widget* widget,
+    bool force_opaque_border) {
   BubbleFrameView* frame = new BubbleFrameView(gfx::Insets());
   const SkColor color = widget->GetNativeTheme()->GetSystemColor(
       ui::NativeTheme::kColorId_DialogBackground);
-  frame->SetBubbleBorder(
-      new BubbleBorder(BubbleBorder::FLOAT, BubbleBorder::SMALL_SHADOW, color));
+  if (force_opaque_border) {
+    frame->SetBubbleBorder(new BubbleBorder(
+        BubbleBorder::NONE,
+        BubbleBorder::NO_SHADOW_OPAQUE_BORDER,
+        color));
+  } else {
+    frame->SetBubbleBorder(new BubbleBorder(BubbleBorder::FLOAT,
+                                            BubbleBorder::SMALL_SHADOW,
+                                            color));
+  }
   frame->SetTitle(widget->widget_delegate()->GetWindowTitle());
   DialogDelegate* delegate = widget->widget_delegate()->AsDialogDelegate();
   if (delegate) {
@@ -166,6 +180,8 @@ NonClientFrameView* DialogDelegate::CreateNewStyleFrameView(Widget* widget) {
   }
   frame->SetShowCloseButton(true);
   frame->set_can_drag(true);
+  if (force_opaque_border)
+    widget->set_frame_type(views::Widget::FRAME_TYPE_FORCE_CUSTOM);
   return frame;
 }