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

chrome/browser/ui/cocoa/constrained_web_dialog_delegate_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.
 
 #include "chrome/browser/ui/webui/constrained_web_dialog_delegate_base.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
@@ skipping 227 matching lines @@
         WebDialogDelegate* delegate,
         content::WebContents* web_contents) {
   // Deleted when the dialog closes.
   ConstrainedWebDialogDelegateViewMac* constrained_delegate =
       new ConstrainedWebDialogDelegateViewMac(
           browser_context, delegate, web_contents,
           gfx::Size(), gfx::Size());
   return constrained_delegate;
 }
 
+ConstrainedWebDialogDelegate* ShowTopLevelConstrainedWebDialog(
+    content::BrowserContext* browser_context,
+    WebDialogDelegate* delegate,
+    content::WebContents* web_contents) {
+  // Mac uses sheets, so we can just use the normal ShowConstrainedWebDialog.
+  return ShowConstrainedWebDialog(browser_context, delegate, web_contents);
+}
+
+// Mac uses sheets so there is no need for this function. Use the normal
+// ShowConstrainedWebDialog.
+ConstrainedWebDialogDelegate* ShowTopLevelConstrainedWebDialogInWindow(
+    content::BrowserContext* browser_context,
+    ui::WebDialogDelegate* delegate,
+    content::WebContents* web_contents,
+    gfx::NativeView dialog_host_window) {
+  return ShowConstrainedWebDialog(browser_context, delegate, web_contents);
+}
+
 ConstrainedWebDialogDelegate* ShowConstrainedWebDialogWithAutoResize(
     content::BrowserContext* browser_context,
     WebDialogDelegate* delegate,
     content::WebContents* web_contents,
     const gfx::Size& min_size,
     const gfx::Size& max_size) {
   DCHECK(!min_size.IsEmpty());
   DCHECK(!max_size.IsEmpty());
   // Deleted when the dialog closes.
   ConstrainedWebDialogDelegateViewMac* constrained_delegate =
       new ConstrainedWebDialogDelegateViewMac(
           browser_context, delegate, web_contents,
           min_size, max_size);
   return constrained_delegate;
 }