#[markdown(off)]
Filed by: egao [at] mozilla.com

https://treeherder.mozilla.org/logviewer.html#?job_id=231977389&repo=try

https://queue.taskcluster.net/v1/task/Z3hwGjTORd2bNGM3QZCwUQ/runs/0/artifacts/public/logs/live_backing.log

Test run: opt-mochitest-browser-chrome-e10s-4

Context:
21:32:18 INFO - TEST-START | browser/components/contextualidentity/test/browser/browser_forgetAPI_EME_forgetThisSite.js
21:32:19 INFO - GECKO(6272) | [Parent 4980, IPC Launch] WARNING: Failed to launch gmplugin subprocess: file z:/build/build/src/ipc/glue/GeckoChildProcessHost.cpp, line 588
21:32:19 INFO - Not taking screenshot here: see the one that was previously logged
21:32:19 INFO - Buffered messages logged at 21:32:18
21:32:19 INFO - Entering test bound setup
21:32:19 INFO - Leaving test bound setup
21:32:19 INFO - Entering test bound test_EME_forgetThisSite
21:32:19 INFO - Buffered messages logged at 21:32:19
21:32:19 INFO - Console message: [JavaScript Error: "The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must be declared in the document or in the transfer protocol." {file: "http://example.com/browser/browser/components/contextualidentity/test/browser/empty_file.html" line: 0}]
21:32:19 INFO - Console message: [JavaScript Warning: "Using Encrypted Media Extensions at http://example.com/browser/browser/components/contextualidentity/test/browser/empty_file.html on an insecure (i.e. non-HTTPS) context is deprecated and will soon be removed. You should consider switching to a secure origin such as HTTPS." {file: "resource://testing-common/content-task.js line 59 > eval" line: 4}]
21:32:19 INFO - Console message: MediaKeySystemAccess::GetKeySystemStatus(org.w3.clearkey) result=available msg=''
21:32:19 INFO - Console message: [JavaScript Warning: "Calling navigator.requestMediaKeySystemAccess() (at http://example.com/browser/browser/components/contextualidentity/test/browser/empty_file.html) passing a candidate MediaKeySystemConfiguration containing audioCapabilities or videoCapabilities without a contentType with a “codecs” string is deprecated and will soon become unsupported." {file: "resource://testing-common/content-task.js line 59 > eval" line: 4}]
21:32:19 INFO - Buffered messages finished
21:32:19 INFO - TEST-UNEXPECTED-FAIL | browser/components/contextualidentity/test/browser/browser_forgetAPI_EME_forgetThisSite.js | Uncaught exception - [Exception... "NS_ERROR_FAILURE (0x80004005) - GMPService::operator() failed since GetContentParent rejects the promise with reason NS_ERROR_FAILURE (0x80004005) - GeckoMediaPluginServiceChild::GetContentParent SendLaunchGMPForNodeId failed with description (Process has not loaded.)." nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "<unknown>" data: no]
21:32:19 INFO - Leaving test bound test_EME_forgetThisSite
21:32:19 INFO - Console message: MediaKeys::Init() promise rejected 0x80004005 'NS_ERROR_FAILURE (0x80004005) - GMPService::operator() failed since GetContentParent rejects the promise with reason NS_ERROR_FAILURE (0x80004005) - GeckoMediaPluginServiceChild::GetContentParent SendLaunchGMPForNodeId failed with description (Process has not loaded.).'
21:32:19 INFO - GECKO(6272) | MEMORY STAT | vsize 5990MB | vsizeMaxContiguous 67270892MB | residentFast 309MB | heapAllocated 121MB
21:32:19 INFO - TEST-OK | browser/components/contextualidentity/test/browser/browser_forgetAPI_EME_forgetThisSite.js | took 162ms
21:32:19 INFO - Not taking screenshot here: see the one that was previously logged
21:32:19 INFO - TEST-UNEXPECTED-FAIL | browser/components/contextualidentity/test/browser/browser_forgetAPI_EME_forgetThisSite.js | Found an unexpected tab at the end of test run: http://example.com/browser/browser/components/contextualidentity/test/browser/empty_file.html -
21:32:19 INFO - checking window state

Good candidate to be disabled for windows10-aarch64 since EME support is not available, see bug 1531927.