http/tests/devtools/sources/debugger/live-edit-no-reveal.js is flaky with site-per-process on Win and Mac (but maybe not on Linux?):

--- e:\b\s\w\iougkv2f\layout-test-results\http/tests/devtools/sources/debugger/live-edit-no-reveal-expected.txt
+++ e:\b\s\w\iougkv2f\layout-test-results\http/tests/devtools/sources/debugger/live-edit-no-reveal-actual.txt
@@ -11,7 +11,7 @@
 Script execution resumed.
 Script execution paused.
 Script execution resumed.
-Cursor position is: (2, 4).
+Cursor position is: (8, 15).
 
 Running: testLiveEditWithStepInWhenPausedThenStepIntoCausesCursorMove
 Script execution paused.