Marijn Kruisselbrink, Thanks for the Mojo fixes

[Vincent Scheib]

Marijn, thank you for diving deep into mojo to diagnose PWA Hangs on macOS Sequoia Beta bug. You went to significant lengths to diagnose and fix what turned out to be multiple difficult edge cases. The CLs below are great work. Thank you for making Chromium more stable in this fundamental area! 🎉

Bug 1 is fixed with https://chromium-review.googlesource.com/c/chromium/src/+/6807214 and https://chromium-review.googlesource.com/c/chromium/src/+/6851552
Bug 2 is fixed by https://chromium-review.googlesource.com/c/chromium/src/+/6825792 and https://chromium-review.googlesource.com/c/chromium/src/+/6851904