Move enable extensions define to a build flag.

chrome/renderer/printing/chrome_print_web_view_helper_delegate.cc

 // Copyright 2015 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/chrome_print_web_view_helper_delegate.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/strings/string_util.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/renderer/prerender/prerender_helper.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_view.h"
+#include "extensions/features/features.h"
 #include "ipc/ipc_message.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebElement.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "chrome/common/extensions/extension_constants.h"
 #include "extensions/common/constants.h"
 #include "extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.h"
-#endif  // defined(ENABLE_EXTENSIONS)
+#endif  // BUILDFLAG(ENABLE_EXTENSIONS)
 
 ChromePrintWebViewHelperDelegate::~ChromePrintWebViewHelperDelegate(){
 }
 
 bool ChromePrintWebViewHelperDelegate::CancelPrerender(
     content::RenderView* render_view, int routing_id) {
   if (!render_view || !prerender::PrerenderHelper::IsPrerendering(
       render_view->GetMainRenderFrame()))
     return false;
 
   return render_view->Send(
       new ChromeViewHostMsg_CancelPrerenderForPrinting(routing_id));
 }
 
 // Return the PDF object element if |frame| is the out of process PDF extension.
 blink::WebElement ChromePrintWebViewHelperDelegate::GetPdfElement(
         blink::WebLocalFrame* frame) {
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   GURL url = frame->document().url();
   bool inside_print_preview = url.GetOrigin() == chrome::kChromeUIPrintURL;
   bool inside_pdf_extension = url.SchemeIs(extensions::kExtensionScheme) &&
                               url.host() == extension_misc::kPdfExtensionId;
   if (inside_print_preview || inside_pdf_extension) {
     // <object> with id="plugin" is created in
     // chrome/browser/resources/pdf/pdf.js.
     auto plugin_element = frame->document().getElementById("plugin");
     if (!plugin_element.isNull()) {
       return plugin_element;
     }
     NOTREACHED();
   }
-#endif  // defined(ENABLE_EXTENSIONS)
+#endif  // BUILDFLAG(ENABLE_EXTENSIONS)
   return blink::WebElement();
 }
 
 bool ChromePrintWebViewHelperDelegate::IsPrintPreviewEnabled() {
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   return !command_line->HasSwitch(switches::kDisablePrintPreview);
 }
 
 bool ChromePrintWebViewHelperDelegate::OverridePrint(
     blink::WebLocalFrame* frame) {
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   if (!frame->document().isPluginDocument())
     return false;
 
   std::vector<extensions::MimeHandlerViewContainer*> mime_handlers =
       extensions::MimeHandlerViewContainer::FromRenderFrame(
           content::RenderFrame::FromWebFrame(frame));
   if (!mime_handlers.empty()) {
     // This message is handled in chrome/browser/resources/pdf/pdf.js and
     // instructs the PDF plugin to print. This is to make window.print() on a
     // PDF plugin document correctly print the PDF. See
     // https://crbug.com/448720.
     base::DictionaryValue message;
     message.SetString("type", "print");
     mime_handlers.front()->PostMessageFromValue(message);
     return true;
   }
-#endif  // defined(ENABLE_EXTENSIONS)
+#endif  // BUILDFLAG(ENABLE_EXTENSIONS)
   return false;
 }