Verify that CSS sourcemap enabling and disabling adds/removes sourcemap sources.


Running: dumpInitialNavigator
top
  127.0.0.1:8000
    devtools
      resources
        inspected-page.html
      sources/resources
        sourcemap-style-1.css
        sourcemap-style-1.scss
        sourcemap-style-2.css
        sourcemap-style-2.scss

Running: disableCSSSourceMaps
top
  127.0.0.1:8000
    devtools
      resources
        inspected-page.html
      sources/resources
        sourcemap-style-1.css
        sourcemap-style-2.css

Running: enableCSSSourceMaps
top
  127.0.0.1:8000
    devtools
      resources
        inspected-page.html
      sources/resources
        sourcemap-style-1.css
        sourcemap-style-1.scss
        sourcemap-style-2.css
        sourcemap-style-2.scss