MacViews: Remove constrained window dependencies for certificate viewer.

chrome/browser/ui/cocoa/certificate_viewer_mac_views.mm

+// Copyright 2016 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.
+
+#import "chrome/browser/ui/cocoa/certificate_viewer_mac_views.h"
+
+#include "chrome/browser/certificate_viewer.h"
+#include "components/constrained_window/constrained_window_views.h"
+#include "components/web_modal/web_contents_modal_dialog_manager.h"
+#include "ui/views/widget/widget.h"
+#include "ui/views/widget/widget_delegate.h"
+
+// A fully transparent, borderless web-modal dialog used to display the
+// OS-provided window-modal sheet that displays certificate information.
+class CertificateAnchorWidgetDelegate : public views::WidgetDelegateView {
+ public:
+  CertificateAnchorWidgetDelegate() {}
+
+  // WidgetDelegate:
+  ui::ModalType GetModalType() const override { return ui::MODAL_TYPE_CHILD; }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CertificateAnchorWidgetDelegate);
+};
+
+@implementation SSLCertificateViewerViewsMac
+
+- (void)sheetDidEnd:(NSWindow*)parent
+         returnCode:(NSInteger)returnCode
+            context:(void*)context {
+  [self closeSheetWithAnimation:YES];

[tapted, 2016/05/19 01:53:25]

Does this need to check [self closePending] and return early?

(I think it probably doesn't, since there's no ConstrainedWindowController, so
nothing else calling closeSheetWithAnimation , in which case we should move
closePending into certificate_viewer_mac_cocoa.mm)

[Patti Lor, 2016/05/25 05:43:00]

Done, have moved closePending to the Cocoa version.

+  overlayWindow_->Close();
+}
+
+- (void)displayForWebContents:(content::WebContents*)webContents {
+  [super displayForWebContents:webContents];
+
+  views::WidgetDelegateView* delegate_ = new CertificateAnchorWidgetDelegate();
+  overlayWindow_.reset(constrained_window::ShowWebModalDialogWithOverlayViews(
+      delegate_, webContents));
+  [self showSheetForWindow:overlayWindow_->GetNativeWindow()];
+}
+
+@end
+
+void ShowCertificateViewer(content::WebContents* web_contents,
+                           gfx::NativeWindow parent,
+                           net::X509Certificate* cert) {
+  SSLCertificateViewerViewsMac* viewer =

[tapted, 2016/05/19 01:53:25]

So I think this allocation is currently leaked. Either way, it needs a comment
about where the allocation is balanced (similar to the cocoa version of this
method), because it's not being allocated into a scoped_nsobject.

The cocoa dialog is self-releasing in  `- (void)onConstrainedWindowClosed`

We might need something similar. Alternatively, I think that perhaps
CertificateAnchorWidgetDelegate can instead own a
scoped_nsobject<SSLCertificateViewerViewsMac>, the widget owns the delegate, so
everything is tied to overlayWindow->Close()

(overlayWindow_->Close(); should get a comment like // Asynchronously releases
|self|.)

[Patti Lor, 2016/05/25 05:43:00]

Done, have taken the second approach you suggested!

+      [[SSLCertificateViewerViewsMac alloc] initWithCertificate:cert];
+  [viewer displayForWebContents:web_contents];
+}