memo:  issue 26144 ,  issue 35208 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5f3d5d7804858d658708344a74978e34f798e8af

commit 5f3d5d7804858d658708344a74978e34f798e8af
Author: Makoto Shimazu <shimazu@chromium.org>
Date: Thu Dec 13 22:37:32 2018

Implement ExtensionLocalizationPeer with data pipe

Previously ExtensionLocalizationPeer::OnStartLoadingResponseBody() passed the
pipe through the |original_peer_|. As we are moving body transfer from
RequestPeer::OnReceivedData to OnStartLoadingResponseBody, this CL implements
OnStartloadingResponseBody() and the following logic.

Bug:  907793 
Change-Id: If85d788084ca089fd34ba9b17b016240ecd29214
Reviewed-on: https://chromium-review.googlesource.com/c/1358311
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616461}
[modify] https://crrev.com/5f3d5d7804858d658708344a74978e34f798e8af/chrome/renderer/extensions/extension_localization_peer.cc
[modify] https://crrev.com/5f3d5d7804858d658708344a74978e34f798e8af/chrome/renderer/extensions/extension_localization_peer.h
[modify] https://crrev.com/5f3d5d7804858d658708344a74978e34f798e8af/chrome/renderer/extensions/extension_localization_peer_unittest.cc