MacViews: Refactor certificate viewer tests to work for MacViews browser.

chrome/browser/ui/cocoa/certificate_viewer_mac_cocoa.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_cocoa.h"
 
 #include "base/logging.h"
 #import "base/mac/foundation_util.h"
 #include "chrome/browser/certificate_viewer.h"
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.h"
@@ skipping 34 matching lines @@
   std::unique_ptr<SSLCertificateViewerCocoaBridge> observer_;
   std::unique_ptr<ConstrainedWindowMac> constrainedWindow_;
   base::scoped_nsobject<NSWindow> overlayWindow_;
   // A copy of the sheet's frame. Used to restore on show.
   NSRect oldSheetFrame_;
   BOOL closePending_;
   // A copy of the sheet's |autoresizesSubviews| flag to restore on show.
   BOOL oldResizesSubviews_;
 }
 
-- (NSWindow*)overlayWindow {
-  return overlayWindow_;
-}
-
 - (void)displayForWebContents:(content::WebContents*)webContents {
   [super displayForWebContents:webContents];
 
   observer_.reset(new SSLCertificateViewerCocoaBridge(self));
   constrainedWindow_ =
       CreateAndShowWebModalDialogMac(observer_.get(), webContents, self);
 }
 
 - (void)onConstrainedWindowClosed {
   constrainedWindow_.reset();
@@ skipping 64 matching lines @@
 void ShowCertificateViewer(content::WebContents* web_contents,
                            gfx::NativeWindow parent,
                            net::X509Certificate* cert) {
   // SSLCertificateViewerCocoa will manage its own lifetime and will release
   // itself when the dialog is closed.
   // See -[SSLCertificateViewerCocoa onConstrainedWindowClosed].
   SSLCertificateViewerCocoa* viewer =
       [[SSLCertificateViewerCocoa alloc] initWithCertificate:cert];
   [viewer displayForWebContents:web_contents];
 }