Centralize the Data Reduction Proxy pass through header

chrome/browser/renderer_context_menu/render_view_context_menu.cc

 // Copyright 2014 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/renderer_context_menu/render_view_context_menu.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <set>
@@ skipping 1715 matching lines @@
       break;
 
     case IDC_CONTENT_CONTEXT_SEARCHWEBFORIMAGE:
       ExecSearchWebForImage();
       break;
 
     case IDC_CONTENT_CONTEXT_OPEN_ORIGINAL_IMAGE_NEW_TAB:
       OpenURLWithExtraHeaders(
           params_.src_url, GetDocumentURL(params_),
           WindowOpenDisposition::NEW_BACKGROUND_TAB, ui::PAGE_TRANSITION_LINK,
-          data_reduction_proxy::kDataReductionPassThroughHeader, false);
+          data_reduction_proxy::chrome_proxy_pass_through_header(), false);
       break;
 
     case IDC_CONTENT_CONTEXT_LOAD_ORIGINAL_IMAGE:
       ExecLoadOriginalImage();
       break;
 
     case IDC_CONTENT_CONTEXT_OPENIMAGENEWTAB:
     case IDC_CONTENT_CONTEXT_OPENAVNEWTAB:
       OpenURL(params_.src_url, GetDocumentURL(params_),
               WindowOpenDisposition::NEW_BACKGROUND_TAB,
@@ skipping 491 matching lines @@
     RecordDownloadSource(DOWNLOAD_INITIATED_BY_CONTEXT_MENU);
     const GURL& url = params_.src_url;
     content::Referrer referrer = CreateReferrer(url, params_);
 
     std::string headers;
     DataReductionProxyChromeSettings* settings =
         DataReductionProxyChromeSettingsFactory::GetForBrowserContext(
             browser_context_);
     if (params_.media_type == WebContextMenuData::kMediaTypeImage && settings &&
         settings->CanUseDataReductionProxy(params_.src_url)) {
-      headers = data_reduction_proxy::kDataReductionPassThroughHeader;
+      headers = data_reduction_proxy::chrome_proxy_pass_through_header();
     }
 
     source_web_contents_->SaveFrameWithHeaders(url, referrer, headers);
   }
 }
 
 void RenderViewContextMenu::ExecExitFullscreen() {
   Browser* browser = GetBrowser();
   if (!browser) {
     NOTREACHED();
@@ skipping 198 matching lines @@
 void RenderViewContextMenu::PluginActionAt(
     const gfx::Point& location,
     const WebPluginAction& action) {
   source_web_contents_->GetRenderViewHost()->
       ExecutePluginActionAtLocation(location, action);
 }
 
 Browser* RenderViewContextMenu::GetBrowser() const {
   return chrome::FindBrowserWithWebContents(embedder_web_contents_);
 }