The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f62b472cb8c427d1b5a17128c2451dc7d6d610f9

commit f62b472cb8c427d1b5a17128c2451dc7d6d610f9
Author: Makoto Shimazu <shimazu@chromium.org>
Date: Wed Dec 19 07:49:43 2018

Make SyncLoadContext work with mojo data pipe

Previously SyncLoadContext::OnStartLoadingResponseBody() is used for downloading
to a blob, but this CL makes it usable in both of downloading to a blob and
downloading to a SyncLoadResponse.

Bug:  911027 
Change-Id: I9287f3b4e6908aaf55b5d49ab8d085792357cfde
Reviewed-on: https://chromium-review.googlesource.com/c/1377960
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#617761}
[modify] https://crrev.com/f62b472cb8c427d1b5a17128c2451dc7d6d610f9/content/renderer/loader/resource_dispatcher.h
[modify] https://crrev.com/f62b472cb8c427d1b5a17128c2451dc7d6d610f9/content/renderer/loader/sync_load_context.cc
[modify] https://crrev.com/f62b472cb8c427d1b5a17128c2451dc7d6d610f9/content/renderer/loader/sync_load_context.h
[add] https://crrev.com/f62b472cb8c427d1b5a17128c2451dc7d6d610f9/content/renderer/loader/sync_load_context_unittest.cc
[modify] https://crrev.com/f62b472cb8c427d1b5a17128c2451dc7d6d610f9/content/test/BUILD.gn