Change the flag which enables OOP PDF to an enable/disable flag

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 889 matching lines @@
   // chrome/browser/resources/print_preview/print_preview.js
   blink::WebElement pdf_element = document.getElementById("pdf-viewer");
   if (pdf_element.isNull()) {
     NOTREACHED();
     return;
   }
 
   // The out-of-process plugin element is nested within a frame.
   blink::WebLocalFrame* plugin_frame = pdf_element.document().frame();
   blink::WebElement plugin_element = pdf_element;
-  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kOutOfProcessPdf)) {
+  if (switches::OutOfProcessPdfEnabled()) {
     if (!pdf_element.hasHTMLTagName("iframe")) {
       NOTREACHED();
       return;
     }
     plugin_frame = blink::WebLocalFrame::fromFrameOwnerElement(pdf_element);
     plugin_element = GetPdfElement(plugin_frame);
     if (plugin_element.isNull()) {
       NOTREACHED();
       return;
     }
@@ skipping 1134 matching lines @@
       blink::WebConsoleMessage::LevelWarning, message));
   return false;
 }
 
 void PrintWebViewHelper::ScriptingThrottler::Reset() {
   // Reset counter on successful print.
   count_ = 0;
 }
 
 }  // namespace printing