Add LOAD_PREFETCH flag for all requests sent by resource prefetcher

chrome/browser/predictors/resource_prefetcher.cc

Index: chrome/browser/predictors/resource_prefetcher.cc
diff --git a/chrome/browser/predictors/resource_prefetcher.cc b/chrome/browser/predictors/resource_prefetcher.cc
index 702f7fc35e2a2018f28fc7652c40129a26ca62f8..dddfa3373cb3621a48108cae156d3c96e7b0ddc2 100644
--- a/chrome/browser/predictors/resource_prefetcher.cc
+++ b/chrome/browser/predictors/resource_prefetcher.cc
@@ -10,6 +10,7 @@
 #include "base/stl_util.h"
 #include "content/public/browser/browser_thread.h"
 #include "net/base/io_buffer.h"
+#include "net/base/load_flags.h"
 #include "net/base/request_priority.h"
 #include "net/url_request/url_request_context.h"
 
@@ -134,6 +135,7 @@ void ResourcePrefetcher::SendRequest(Request* request) {
   url_request->set_method("GET");
   url_request->set_first_party_for_cookies(navigation_id_.main_frame_url);
   url_request->SetReferrer(navigation_id_.main_frame_url.spec());
+  url_request->SetLoadFlags(url_request->load_flags() | net::LOAD_PREFETCH);
   StartURLRequest(url_request);
 }