Bug 1938659 Comment 7 Edit History

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Backed out for causing mochitests failures.
* [Backout link](https://hg.mozilla.org/integration/autoland/rev/13b8575117d2de8187d452e3f40fa9c9aafedded)
* [Push with failures](https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception&fromchange=17b22d41772752364884f7efca2ff5e2abaeecd0&searchStr=linux%2C18.04%2Cx64%2Cwebrender%2Cdebug%2Cmochitests%2Cwith%2Csoftware%2Cwebrender%2Cenabled%2Ctest-linux1804-64-qr%2Fdebug-mochitest-browser-chrome-swr%2Cbc9&tochange=b548e5bef6859c0513defaf7596191dd7e33fca6&selectedTaskRun=J_I76r0ESf-ihVSswtRLGQ.0) 
* [Failure Log](https://treeherder.mozilla.org/logviewer?job_id=489271260&repo=autoland) 
* Failure line: TEST-UNEXPECTED-FAIL | browser/components/contextualidentity/test/browser/browser_aboutURLs.js | A promise chain failed to handle a rejection: Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getBoolPref] - stack: refreshPage@chrome://global/content/aboutInference.js:434:20
Backed out for causing mochitests failures.
* [Backout link](https://hg.mozilla.org/integration/autoland/rev/13b8575117d2de8187d452e3f40fa9c9aafedded)
* [Push with failures - some mochitests failures](https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception&fromchange=17b22d41772752364884f7efca2ff5e2abaeecd0&searchStr=linux%2C18.04%2Cx64%2Cwebrender%2Cdebug%2Cmochitests%2Cwith%2Csoftware%2Cwebrender%2Cenabled%2Ctest-linux1804-64-qr%2Fdebug-mochitest-browser-chrome-swr%2Cbc9&tochange=b548e5bef6859c0513defaf7596191dd7e33fca6&selectedTaskRun=J_I76r0ESf-ihVSswtRLGQ.0) 
* [Failure Log](https://treeherder.mozilla.org/logviewer?job_id=489271260&repo=autoland) 
* Failure line: TEST-UNEXPECTED-FAIL | browser/components/contextualidentity/test/browser/browser_aboutURLs.js | A promise chain failed to handle a rejection: Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getBoolPref] - stack: refreshPage@chrome://global/content/aboutInference.js:434:20

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* [Push with failures - some other mochitests failures](https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception&fromchange=7ebdbb429a63cffba1c7dcca1a198c95233d7c38&searchStr=android%2C7.0%2Cx86-64%2Clite%2Cwebrender%2Copt%2Cmochitests%2Ctest-android-em-7.0-x86_64-lite-qr%2Fopt-geckoview-mochitest-plain%2C4&tochange=b548e5bef6859c0513defaf7596191dd7e33fca6&selectedTaskRun=PV6qGJUoTvGrMnv4YUFtAg.0) 
* [Failure Log](https://treeherder.mozilla.org/logviewer?job_id=489270678&repo=autoland) 
* Failure line: TEST-UNEXPECTED-FAIL | dom/workers/test/test_navigator_secureContext.html | Worker had an error: uncaught exception: Navigator has the 'gpu' property that isn't in the list!

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