In file layout/xul/nsResizerFrame.cpp

Obtains DocShell from PresContext, and checks its ItemType.

Change to use BrowsingContex ItemType.

Kannan says replacing nsIDocShellTreeItem calls should block enabling Fission in Nightly (M6).

Backed out changeset 7da82c2eea17 (bug 1597488) for chrome failures at layout/xul/test/test_resizer.xhtml

Backout: https://hg.mozilla.org/integration/autoland/rev/fdb7d4f7cacb1c22a97b59734d7fcd1fdf12c802

Failure push: https://treeherder.mozilla.org/#/jobs?repo=autoland&revision=7da82c2eea17d0bef54e5db27f822174ccdb05c9

Failure log: https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=283353630&repo=autoland&lineNumber=30102

[task 2020-01-03T14:39:30.984Z] 14:39:30 INFO - TEST-PASS | layout/xul/test/test_resizer.xhtml | Bad y for -1,-1 moving -1,-1
[task 2020-01-03T14:39:30.984Z] 14:39:30 INFO - Buffered messages finished
[task 2020-01-03T14:39:30.984Z] 14:39:30 INFO - TEST-UNEXPECTED-FAIL | layout/xul/test/test_resizer.xhtml | Bad width for -1,-1 moving -1,-1 - got 300, expected 305
[task 2020-01-03T14:39:30.984Z] 14:39:30 INFO - SimpleTest.is@chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:325:16
[task 2020-01-03T14:39:30.984Z] 14:39:30 INFO - testResizer@chrome://mochitests/content/chrome/layout/xul/test/window_resizer.xhtml:53:11
[task 2020-01-03T14:39:30.984Z] 14:39:30 INFO - doTest@chrome://mochitests/content/chrome/layout/xul/test/window_resizer.xhtml:66:14
[task 2020-01-03T14:39:30.984Z] 14:39:30 INFO - setTimeout handler*onload@chrome://mochitests/content/chrome/layout/xul/test/window_resizer.xhtml:1:11
[task 2020-01-03T14:39:30.984Z] 14:39:30 INFO - Not taking screenshot here: see the one that was previously logged

(In reply to Cristina Coroiu [:ccoroiu] from comment #4)

Backed out changeset 7da82c2eea17 (bug 1597488) for chrome failures at layout/xul/test/test_resizer.xhtml

Ugh, I pushed some patch patterns to try, the patch which uses BrowsingContext would not be a problem...

• aPresShell->GetPresContext()->IsChrome()
• Using BrowsingContext & fix bug 1597407
  • https://hg.mozilla.org/try/rev/cf56fb67a75a4860b56d81c0f50438ad3fd1a4be
  • https://hg.mozilla.org/try/rev/cf56fb67a75a4860b56d81c0f50438ad3fd1a4be
• Using BrowsingContext
  • https://hg.mozilla.org/try/rev/a97c239314792b136197aa4cba2de000edf89d7c
• aPresShell->GetPresContext()->IsChrome()` & fix bug 1597407
  • https://hg.mozilla.org/try/rev/80a5b46db0845f88b7e2d4dbe4b6521d39203ef9
  • https://hg.mozilla.org/try/rev/f32a236c63721244472345b737f5e22cf05e5db5

I’m embarrassed. I forget to invert the boolean value after changing the code.
https://phabricator.services.mozilla.com/D58483

https://hg.mozilla.org/mozilla-central/rev/a25ca01f3229