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

chrome/browser/prerender/prerender_manager.cc

Index: chrome/browser/prerender/prerender_manager.cc
diff --git a/chrome/browser/prerender/prerender_manager.cc b/chrome/browser/prerender/prerender_manager.cc
index e4dfb19c7cef312817c55b56b2e27c23a1debc43..8e11f54c7b29a72a57688d3fe29eda5076a77e74 100644
--- a/chrome/browser/prerender/prerender_manager.cc
+++ b/chrome/browser/prerender/prerender_manager.cc
@@ -298,7 +298,10 @@ bool PrerenderManager::MaybeUsePrerenderedPage(const GURL& url,
   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;