intent to ship email sent: https://groups.google.com/a/chromium.org/d/msg/blink-dev/AGyufsf5XU4/CBeVLmT7BgAJ

What's the relationship between this bug and  issue 680531 ?  Does it make sense to do one without the other, or are they really the same thing?

I wasn't aware of that bug, thanks for pointing it out. While strictly speaking that one is about supporting records and this one is about dropping URLSearchParams from the union, the fix ends up being the same so I've assigned both bugs to myself.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8e6727773d5da351bc6eb887dc491cc599c9e6d7

commit 8e6727773d5da351bc6eb887dc491cc599c9e6d7
Author: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Date: Tue Jun 27 10:12:39 2017

url: Update URLSearchParams' constructor arguments.

Adapt to https://github.com/whatwg/url/pull/175, which dropped
URLSearchParams itself from the union accepted by the constructor. The
constructor now takes an optional

  (sequence<sequence<USVString>> or record<USVString, USVString> or USVString)

instead. Existing uses of `new URLSearchParams(<existing URLSearchParam>)`
continue to work, as per WebIDL these objects are converted to sequences
because URLSearchParams is iterable.

Intent to ship/implement thread:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/AGyufsf5XU4/CBeVLmT7BgAJ

Bug:  680531 ,  697378 
Change-Id: Ie82d1151acc4334628be0cc258bc20e5a0dc1d15
Reviewed-on: https://chromium-review.googlesource.com/544919
Commit-Queue: Raphael Kubo da Costa (rakuco) <raphael.kubo.da.costa@intel.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#482588}
[modify] https://crrev.com/8e6727773d5da351bc6eb887dc491cc599c9e6d7/third_party/WebKit/LayoutTests/external/wpt/url/urlsearchparams-constructor-expected.txt
[modify] https://crrev.com/8e6727773d5da351bc6eb887dc491cc599c9e6d7/third_party/WebKit/LayoutTests/fast/domurl/urlsearchparams-constructor.html
[modify] https://crrev.com/8e6727773d5da351bc6eb887dc491cc599c9e6d7/third_party/WebKit/Source/bindings/core/v8/BUILD.gn
[modify] https://crrev.com/8e6727773d5da351bc6eb887dc491cc599c9e6d7/third_party/WebKit/Source/core/dom/URLSearchParams.cpp
[modify] https://crrev.com/8e6727773d5da351bc6eb887dc491cc599c9e6d7/third_party/WebKit/Source/core/dom/URLSearchParams.h
[modify] https://crrev.com/8e6727773d5da351bc6eb887dc491cc599c9e6d7/third_party/WebKit/Source/core/dom/URLSearchParams.idl