Enable AutoResize for Constrained Web Dialogs for Mac.

chrome/browser/ui/cocoa/certificate_viewer_mac.mm

 // Copyright (c) 2012 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.h"
 
 #include <Security/Security.h>
 #include <SecurityInterface/SFCertificatePanel.h>
 #include <vector>
 
@@ skipping 116 matching lines @@
   status = net::x509_util::CreateRevocationPolicies(false, false, policies);
   if (status != noErr) {
     NOTREACHED();
     return;
   }
 
   panel_.reset([[SFCertificatePanel alloc] init]);
   [panel_ setPolicies:(id) policies.get()];
 
   constrainedWindow_.reset(
-      new ConstrainedWindowMac(observer_.get(), webContents, self));
+      CreateAndShowWebModalDialogMac(observer_.get(), webContents, self));
 }
 
 - (NSWindow*)overlayWindow {
   return overlayWindow_;
 }
 
 - (void)showSheetForWindow:(NSWindow*)window {
   overlayWindow_.reset([window retain]);
   [panel_ beginSheetForWindow:window
                 modalDelegate:self
@@ skipping 42 matching lines @@
 }
 
 - (void)makeSheetKeyAndOrderFront {
   [[overlayWindow_ attachedSheet] makeKeyAndOrderFront:nil];
 }
 
 - (void)updateSheetPosition {
   // NOOP
 }
 
+- (void)resizeWithNewSize:(NSSize)preferredSize {
+  // NOOP
+}
+
 - (NSWindow*)sheetWindow {
   return panel_;
 }
 
 - (void)onConstrainedWindowClosed {
   panel_.reset();
   constrainedWindow_.reset();
   [self release];
 }
 
 @end