[Reland] Enable AutoResize for Constrained Web Dialogs for Mac.

chrome/browser/ui/cocoa/certificate_viewer_mac.mm

Index: chrome/browser/ui/cocoa/certificate_viewer_mac.mm
diff --git a/chrome/browser/ui/cocoa/certificate_viewer_mac.mm b/chrome/browser/ui/cocoa/certificate_viewer_mac.mm
index 5c41b94f781af08ab025b2c570eba79052927d16..1adb0f166bd8687c67f8d0aa8155bed3b1d21f63 100644
--- a/chrome/browser/ui/cocoa/certificate_viewer_mac.mm
+++ b/chrome/browser/ui/cocoa/certificate_viewer_mac.mm
@@ -134,8 +134,8 @@ void ShowCertificateViewer(content::WebContents* web_contents,
   panel_.reset([[SFCertificatePanel alloc] init]);
   [panel_ setPolicies:(id) policies.get()];
 
-  constrainedWindow_.reset(
-      new ConstrainedWindowMac(observer_.get(), webContents, self));
+  constrainedWindow_ =
+      CreateAndShowWebModalDialogMac(observer_.get(), webContents, self);
 }
 
 - (NSWindow*)overlayWindow {
@@ -189,6 +189,10 @@ void ShowCertificateViewer(content::WebContents* web_contents,
   // NOOP
 }
 
+- (void)resizeWithNewSize:(NSSize)preferredSize {
+  // NOOP
+}
+
 - (NSWindow*)sheetWindow {
   return panel_;
 }