Foreign fetch was removed from the SW spec.

[jeffposnick]

As per w3c/ServiceWorker#1188, foreign fetch was officially removed from the service worker specification.

Target Live Date: 2018-06-07

• This has been reviewed and approved by (@petele)
• I have run gulp test locally and all tests pass.
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CC: @petele

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WARNINGS
src/content/en/updates/2016/09/foreign-fetch.md#L243 - Updates post is missing RSS feed widget: '{% include "web/_shared/rss-widget-updates.html" %}'
src/content/en/updates/2016/09/foreign-fetch.md#L9 - Common typo found: 'ServiceWorker' Should it be 'service worker'? Capitalize Service if it's the first word in the sentence.
src/content/en/updates/2016/09/foreign-fetch.md#L11 - Common typo found: 'Service Worker' Should it be 'service worker'? Capitalize Service if it's the first word in the sentence.
src/content/en/updates/2016/09/foreign-fetch.md#L17 - Common typo found: 'ServiceWorker' Should it be 'service worker'? Capitalize Service if it's the first word in the sentence.
src/content/en/updates/2016/09/foreign-fetch.md#L24 - Common typo found: 'ServiceWorker' Should it be 'service worker'? Capitalize Service if it's the first word in the sentence.
src/content/en/updates/2016/09/foreign-fetch.md#L71 - Common typo found: 'ServiceWorker' Should it be 'service worker'? Capitalize Service if it's the first word in the sentence.
src/content/en/updates/2016/09/foreign-fetch.md#L79 - Common typo found: 'ServiceWorker' Should it be 'service worker'? Capitalize Service if it's the first word in the sentence.
src/content/en/updates/2016/09/foreign-fetch.md#L81 - Common typo found: 'ServiceWorker' Should it be 'service worker'? Capitalize Service if it's the first word in the sentence.
src/content/en/updates/2016/09/foreign-fetch.md#L81 - Common typo found: 'ServiceWorker' Should it be 'service worker'? Capitalize Service if it's the first word in the sentence.
src/content/en/updates/2016/09/foreign-fetch.md#L92 - Common typo found: 'ServiceWorker' Should it be 'service worker'? Capitalize Service if it's the first word in the sentence.
src/content/en/updates/2016/09/foreign-fetch.md#L234 - Common typo found: 'ServiceWorker' Should it be 'service worker'? Capitalize Service if it's the first word in the sentence.
src/content/en/updates/2016/09/foreign-fetch.md#L236 - Common typo found: 'ServiceWorker' Should it be 'service worker'? Capitalize Service if it's the first word in the sentence.
src/content/en/updates/2016/09/foreign-fetch.md#L24 - Line must be at most 100 characters
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