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The original tests in PDFExtensionJSTest.AnnotationsFeatureEnabled
tested the behaviors of the ink controller, and did not clear the DOM.

The new tests, which only test parts of the UI inside the toolbar, clear
the DOM, exposing the tests to potential flakiness if any calls are
made to the plugin near when the DOM is being cleared. When the DOM is
cleared, references to the plugin's members, including the postMessage()
function, vanish.

Bug: 1136319
Change-Id: I3e6b4dd8c1ef8a23281c100c4a8748d36e642365
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2478104
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821114}