v8.detached_context_age_in_gc failing on 19 builders

Builders failed on: 
- Android Nexus5X Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus5X%20Perf
- Android Nexus5X WebView Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus5X%20WebView%20Perf
- Android Nexus6 Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus6%20Perf
- Android Nexus7v2 Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus7v2%20Perf
- Android One Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Android%20One%20Perf
- Linux Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Linux%20Perf
- Mac 10.11 Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Mac%2010.11%20Perf
- Mac 10.12 Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Mac%2010.12%20Perf
- Mac Air 10.11 Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Mac%20Air%2010.11%20Perf
- Mac Pro 10.11 Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Mac%20Pro%2010.11%20Perf
- Mac Retina Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Mac%20Retina%20Perf
- Win 10 High-DPI Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Win%2010%20High-DPI%20Perf
- Win 10 Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Win%2010%20Perf
- Win 7 ATI GPU Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Win%207%20ATI%20GPU%20Perf
- Win 7 Intel GPU Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Win%207%20Intel%20GPU%20Perf
- Win 7 Nvidia GPU Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Win%207%20Nvidia%20GPU%20Perf
- Win 7 Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Win%207%20Perf
- Win 7 x64 Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Win%207%20x64%20Perf
- Win 8 Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Win%208%20Perf

https://uberchromegw.corp.google.com/i/chromium.perf/builders/Android%20Nexus5X%20Perf/builds/486 is a first instance of this failure.

It looks like the wpr re-record in https://chromium.googlesource.com/chromium/src/+/71d0b6e55036e66e74dde48b1c7d5364eb1e5b1d probably caused this. wkorman@ can you take a look? If there's another bug for this feel free to merge into.