The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f8daa6827b494ae034395db38e756efee07f08ae

commit f8daa6827b494ae034395db38e756efee07f08ae
Author: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Date: Wed Sep 27 17:23:41 2017

fetch: Add [NewObject] to IDL declarations that have it in the spec.

Several IDL methods have been annotated with the [NewObject] extended
attribute since 2014 (Fetch spec commit 92f9337cd2, "Sprinkle [NewObject],
[SameObject] love").

Add it to our IDLs for spec compliance. In practice, at the moment this is a
no-op for methods that return promises and it adds a DCHECK for methods that
return interface types.

Request.clone() and Response.clone() also need the Blink-specific
[DoNotTestNewObject] extended attribute, as their C++ implementations call
ToV8() on the new object they return, which causes the DCHECKs to fail (in
other words, [NewObject] becomes a no-op for them as well).

Bug:  769221 

Change-Id: If1d598660efef656d165a79618a45ea8ddc99e30
Reviewed-on: https://chromium-review.googlesource.com/685658
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Raphael Kubo da Costa (rakuco) <raphael.kubo.da.costa@intel.com>
Cr-Commit-Position: refs/heads/master@{#504717}
[modify] https://crrev.com/f8daa6827b494ae034395db38e756efee07f08ae/third_party/WebKit/Source/modules/fetch/Body.idl
[modify] https://crrev.com/f8daa6827b494ae034395db38e756efee07f08ae/third_party/WebKit/Source/modules/fetch/Request.idl
[modify] https://crrev.com/f8daa6827b494ae034395db38e756efee07f08ae/third_party/WebKit/Source/modules/fetch/Response.idl
[modify] https://crrev.com/f8daa6827b494ae034395db38e756efee07f08ae/third_party/WebKit/Source/modules/fetch/WindowFetch.idl
[modify] https://crrev.com/f8daa6827b494ae034395db38e756efee07f08ae/third_party/WebKit/Source/modules/fetch/WorkerFetch.idl

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/684f43bff55fd6c4b6d27b65b5844d530e427212

commit 684f43bff55fd6c4b6d27b65b5844d530e427212
Author: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Date: Thu Sep 28 11:20:35 2017

fetch: Add [SameObject] to Request.headers and Response.headers.

Adapt to
https://github.com/whatwg/fetch/commit/92f9337cd20402c4168cf15332b0116013474db8
and add the [SameObject] extended attribute where it's used in the spec.

In practice, there is no change to the generated code, as [SameObject] on
its own is a no-op to our bindings layer and we always return the same Header
object from Request and Response.

Tests for this extended attribute were added upstream in
https://github.com/w3c/web-platform-tests/pull/7511 (which has already been
imported into Blink).

Bug:  769221 
Change-Id: Iad0a1ac72517f2da63013c9f7cff92cffe989af5
Reviewed-on: https://chromium-review.googlesource.com/689614
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Raphael Kubo da Costa (rakuco) <raphael.kubo.da.costa@intel.com>
Cr-Commit-Position: refs/heads/master@{#504970}
[modify] https://crrev.com/684f43bff55fd6c4b6d27b65b5844d530e427212/third_party/WebKit/Source/modules/fetch/Request.idl
[modify] https://crrev.com/684f43bff55fd6c4b6d27b65b5844d530e427212/third_party/WebKit/Source/modules/fetch/Response.idl