Remove unused helper code

[Snuffleupagus]

• Remove the unused isWorker property from src/display/global.js

  This has been completely unused since commit 1d12aed, in PR Move all PDFJS display/ usages into global.js file. #7126, almost one and a half years ago.

• Remove the unused Util.sign function from src/shared/util.js

  This has been completely unused since commit 10bb6c9, in PR Refactors encodeFloat, font matrix and flex args #2505, more than four and a half years ago.

[timvandermeij]

/botio-linux preview

[pdfjsbot]

From: Bot.io (Linux m4)

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Received

Command cmd_preview from @timvandermeij received. Current queue size: 0

Live output at: http://54.67.70.0:8877/b7a4163539443a8/output.txt

[pdfjsbot]

From: Bot.io (Linux m4)

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Success

Full output at http://54.67.70.0:8877/b7a4163539443a8/output.txt

Total script time: 2.32 mins

Published

• Viewer: http://54.67.70.0:8877/b7a4163539443a8/web/viewer.html
• Extension: http://54.67.70.0:8877/b7a4163539443a8/extensions/firefox/pdf.js.xpi

[timvandermeij]

/botio test

[pdfjsbot]

From: Bot.io (Linux m4)

---

Received

Command cmd_test from @timvandermeij received. Current queue size: 0

Live output at: http://54.67.70.0:8877/39990c2ad5086d8/output.txt

[pdfjsbot]

From: Bot.io (Windows)

---

Received

Command cmd_test from @timvandermeij received. Current queue size: 0

Live output at: http://54.215.176.217:8877/1d1261945206c47/output.txt

[pdfjsbot]

From: Bot.io (Linux m4)

---

Success

Full output at http://54.67.70.0:8877/39990c2ad5086d8/output.txt

Total script time: 16.81 mins

• Font tests: Passed
• Unit tests: Passed
• Regression tests: Passed

[pdfjsbot]

From: Bot.io (Windows)

---

Success

Full output at http://54.215.176.217:8877/1d1261945206c47/output.txt

Total script time: 22.75 mins

• Font tests: Passed
• Unit tests: Passed
• Regression tests: Passed

[timvandermeij]

Thank you for cleaning this up!