Bug 1720045: Switch to WHATWG abort controller polyfill

[TheRealJon]

Switch to https://github.com/mysticatea/abort-controller polyfill which is intended for use with whatwg-fetch (which is what we are using).

Polyfill added by #1775 caused a regression because it was intended for use with node-fetch.

Tested against latest Chrome and Firefox to ensure native AbortController support isn't broken by polyfill. No runtime errors.

Tested against Firefox v56.0.2 to ensure polyfill works as expected. No runtime errors.

[spadgett]

/cc @kyoto

[openshift-ci-robot]

@TheRealJon: This pull request references a valid Bugzilla bug.

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In response to this:

Bug 1720045: Switch to WHATWG abort controller polyfill

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[spadgett]

/lgtm

[openshift-ci-robot]

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[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.

[TheRealJon]

Looks like an actual test flake:

Failed Specs:

1) Modal Annotations : Delete Annotation
   StaleElementReferenceError: stale element reference: element is not attached to the page document
     (Session info: headless chrome=73.0.3683.86)
     (Driver info: chromedriver=2.46.628388 (4a34a70827ac54148e092aafb70504c4ea7ae926),platform=Linux 3.10.0-957.1.3.el7.x86_64 x86_64)
       at Object.checkLegacyResponse /go/src/github.com/openshift/console/frontend/node_modules/selenium-webdriver/lib/error.js:546:15
       at parseHttpResponse /go/src/github.com/openshift/console/frontend/node_modules/selenium-webdriver/lib/http.js:509:13
       at doSend.then.response /go/src/github.com/openshift/console/frontend/node_modules/selenium-webdriver/lib/http.js:441:30
       at process._tickCallback internal/process/next_tick.js:68:7
   From: Task: WebElement.getAttributevalue
       at Driver.schedule /go/src/github.com/openshift/console/frontend/node_modules/selenium-webdriver/lib/webdriver.js:807:17
       at WebElement.schedule_ /go/src/github.com/openshift/console/frontend/node_modules/selenium-webdriver/lib/webdriver.js:2010:25
       at WebElement.getAttribute /go/src/github.com/openshift/console/frontend/node_modules/selenium-webdriver/lib/webdriver.js:2263:17
       at actionFn /go/src/github.com/openshift/console/frontend/node_modules/protractor/built/element.js:89:44
       at Array.map <anonymous>
       at actionResults.getWebElements.then /go/src/github.com/openshift/console/frontend/node_modules/protractor/built/element.js:461:65
       at ManagedPromise.invokeCallback_ /go/src/github.com/openshift/console/frontend/node_modules/selenium-webdriver/lib/promise.js:1376:14
       at TaskQueue.execute_ /go/src/github.com/openshift/console/frontend/node_modules/selenium-webdriver/lib/promise.js:3084:14
       at TaskQueue.executeNext_ /go/src/github.com/openshift/console/frontend/node_modules/selenium-webdriver/lib/promise.js:3067:27
       at asyncRun /go/src/github.com/openshift/console/frontend/node_modules/selenium-webdriver/lib/promise.js:2927:27Error
       at ElementArrayFinder.applyAction_ /go/src/github.com/openshift/console/frontend/node_modules/protractor/built/element.js:459:27
       at ElementArrayFinder.anonymous function.args [as getAttribute] /go/src/github.com/openshift/console/frontend/node_modules/protractor/built/element.js:91:29
       at ElementFinder.anonymous function.args [as getAttribute] /go/src/github.com/openshift/console/frontend/node_modules/protractor/built/element.js:831:22
       at /go/src/github.com/openshift/console/frontend/integration-tests/tests/modal-annotations.scenario.ts:59:69
       at step /go/src/github.com/openshift/console/frontend/integration-tests/tests/modal-annotations.scenario.ts:32:23
       at Object.next /go/src/github.com/openshift/console/frontend/integration-tests/tests/modal-annotations.scenario.ts:13:53
       at fulfilled /go/src/github.com/openshift/console/frontend/integration-tests/tests/modal-annotations.scenario.ts:4:58
       at process._tickCallback internal/process/next_tick.js:68:7

[spadgett]

Yeah, known flake: https://jira.coreos.com/browse/CONSOLE-1294

We should track that down