Created min size for print preview dialog and modified to allow the

chrome/browser/ui/cocoa/constrained_web_dialog_delegate_mac.mm

Index: chrome/browser/ui/cocoa/constrained_web_dialog_delegate_mac.mm
diff --git a/chrome/browser/ui/cocoa/constrained_web_dialog_delegate_mac.mm b/chrome/browser/ui/cocoa/constrained_web_dialog_delegate_mac.mm
index 9ef87e6b73aa7350a02eaa7dd2a93749a4a357a0..1b04e21d8a534c94350405a7ccd0242a0e98a850 100644
--- a/chrome/browser/ui/cocoa/constrained_web_dialog_delegate_mac.mm
+++ b/chrome/browser/ui/cocoa/constrained_web_dialog_delegate_mac.mm
@@ -245,6 +245,18 @@ ConstrainedWebDialogDelegate* ShowConstrainedWebDialog(
   return constrained_delegate;
 }
 
+ConstrainedWebDialogDelegate* ShowTopLevelConstrainedWebDialog(
+    content::BrowserContext* browser_context,
+    WebDialogDelegate* delegate,
+    content::WebContents* web_contents) {
+  // Deleted when the dialog closes.
+  NOTREACHED();  // This is not needed on Mac since Mac uses sheets.
+  ConstrainedWebDialogDelegateViewMac* constrained_delegate =
+      new ConstrainedWebDialogDelegateViewMac(
+          browser_context, delegate, web_contents, gfx::Size(), gfx::Size());
+  return constrained_delegate;
+}
+
 ConstrainedWebDialogDelegate* ShowConstrainedWebDialogWithAutoResize(
     content::BrowserContext* browser_context,
     WebDialogDelegate* delegate,