Use frame/origin-bound URLLoaderFactory in PrepareFrameAndViewForPrint.

This CL modifies PrepareFrameAndViewForPrint::CreateURLLoaderFactory
method so that it delegates creation of URLLoaderFactory to the frame
being printed.

Bug: 891872
Change-Id: I42a87f908e18b751bf8dd1d192b4fa2e34141d09
Reviewed-on: https://chromium-review.googlesource.com/c/1356022Reviewed-by: Wei Li <weili@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612728}

components/printing/renderer/print_render_frame_helper.cc

@@ -1007,7 +1007,7 @@ void PrepareFrameAndViewForPrint::BeginNavigation(
 
 std::unique_ptr<blink::WebURLLoaderFactory>
 PrepareFrameAndViewForPrint::CreateURLLoaderFactory() {
-  return blink::Platform::Current()->CreateDefaultURLLoaderFactory();
+  return frame_.GetFrame()->Client()->CreateURLLoaderFactory();
 }
 
 void PrepareFrameAndViewForPrint::CallOnReady() {