Bug 1506499 [wpt PR 14017] - Preparation of moving LayoutTests to web_tests., a=testonly

Bug 1506499 [wpt PR 14017] - Preparation of moving LayoutTests to web_tests., a=testonly

Automatic update from web-platform-testsPreparation of moving LayoutTests to web_tests.

* layout_test_content_browser_client.cc:
  Pass --tests-in-blink flag to a renderer process.
  GetWebTestsFilePath() in blink_test_helpers.cc needs this flag.

* LayoutTests/editing/assert_selection.html
* LayoutTests/editing/assert_selection.js
* LayoutTests/editing/execCommand/insert-paragraph-into-table-expected.txt
  Drop 'LayoutTests/' part from error description

* LayoutTests/external/wpt/bluetooth/resources/bluetooth-helpers.js
* LayoutTests/external/wpt/webusb/resources/usb-helpers.js
  Support web_tests/ as well as LayoutTests/

* LayoutTests/fast/js/exception-line-number-expected.txt
* LayoutTests/fast/js/script-tests/exception-line-number.js
  Drop 'LayoutTests/' part from error description

Bug: 843412
Change-Id: I817b40bb2e7edf0216a32d9f3a3e2320e4b6956a
Reviewed-on: https://chromium-review.googlesource.com/c/1329811
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607165}

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wpt-commits: fde96a64c643c81649f3abe7768be240264df57f
wpt-pr: 14017