Injected DOM wrappers were a nice idea in theory but everyone just passes
wrappers around document.createElement/document.createTextNode. That
includes HtmlReporter's unit tests and karma-jasmine-html-reporter, the
only known 5.x-compatible library that constructs an HtmlReporter.
This change broke spec filtering in Karma by changing the format of the
`spec` query parameter. Although karma-jasmine-html-reporter uses
jasmine-core's HtmlSpecFilter, karm-jasmine provides its own spec filter
that interprets the query parameters itself.
This feature may be reintroduced in 6.0 as a breaking change.
This reverts commit 8309416cb2.
