Revert of Restored disable print preview policy.

chrome/renderer/printing/print_web_view_helper.cc

 // 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/renderer/printing/print_web_view_helper.h"
 
 #include <string>
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
@@ skipping 766 matching lines @@
       reset_prep_frame_view_(false),
       is_print_ready_metafile_sent_(false),
       ignore_css_margins_(false),
       is_scripted_printing_blocked_(false),
       notify_browser_of_print_failure_(true),
       print_for_preview_(false),
       print_node_in_progress_(false),
       is_loading_(false),
       is_scripted_preview_delayed_(false),
       weak_ptr_factory_(this) {
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kDisablePrintPreview)) {
-    DisablePreview();
-  }
 }
 
 PrintWebViewHelper::~PrintWebViewHelper() {}
 
 // static
 void PrintWebViewHelper::DisablePreview() {
   g_is_preview_enabled_ = false;
 }
 
 bool PrintWebViewHelper::IsScriptInitiatedPrintAllowed(
@@ skipping 1220 matching lines @@
       blink::WebConsoleMessage::LevelWarning, message));
   return false;
 }
 
 void PrintWebViewHelper::ScriptingThrottler::Reset() {
   // Reset counter on successful print.
   count_ = 0;
 }
 
 }  // namespace printing