Revert "feat(http): support coalescing http requests"

This reverts commit 1fb668b7f7154fd40a4112f2b24f455557ae740d.

Only reverting because g3 is not ready for it yet.
fix(cache): Make UnboundedCache extend Cache

Closes #1174
docs(developer): fix developer docs listing incorrect scripts to run for testing

DEVELOPER.md previously directed developers to run scrips/env.sh before running
tests, which is unnecessary and will cause their terminal to exit whenever
a command ends with a non-0 exit code.

Closes #1187
Closes #1188
docs(developer): fix typo in DEVELOPER.md

Closes #1210
fix(examples): do not use shadow DOM

This is in preparation for implementing the Testability API and Protractor
end-to-end tests since chromedriver can't handle shadowDom references.