web_renderjs_ui_test: fix flaky testFormViewHistoricalRevisionLink
This test was using a blind `pause` instead of an explicit waitFor*, so it was failing when machine was not fast enough. Also refactor the test a bit to simplify the assertion by first selecting the iframe we are going to inspect and make the test compatible with both chrome and firefox - they behave differently when interpreting new lines in selenium test tables. /reviewed-on !967
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