Preserving Content-Type header from http request in OpenURL path.

chrome/browser/prerender/prerender_manager.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/browser/prerender/prerender_manager.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <functional>
@@ skipping 280 matching lines @@
   }
 }
 
 bool PrerenderManager::MaybeUsePrerenderedPage(const GURL& url,
                                                chrome::NavigateParams* params) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   WebContents* web_contents = params->target_contents;
   DCHECK(!IsWebContentsPrerendering(web_contents, nullptr));
 
-  // Don't prerender if the navigation involves some special parameters.
+  // Don't prerender if the navigation involves some special parameters that
+  // are different from what was used by PrerenderContents::StartPrerendering
+  // (which always uses GET method and doesn't specify any extra headers when
+  // calling content::NavigationController::LoadURLWithParams).
   if (params->uses_post || !params->extra_headers.empty())
     return false;
 
   DeleteOldEntries();
   to_delete_prerenders_.clear();
 
   // First, try to find prerender data with the correct session storage
   // namespace.
   // TODO(ajwong): This doesn't handle isolated apps correctly.
   PrerenderData* prerender_data = FindPrerenderData(
@@ skipping 1031 matching lines @@
   DCHECK_EQ(1u, erased);
 }
 
 void PrerenderManager::SetPrerenderContentsFactoryForTest(
     PrerenderContents::Factory* prerender_contents_factory) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   prerender_contents_factory_.reset(prerender_contents_factory);
 }
 
 }  // namespace prerender