Verify that navigator is updated as frame gets navigated.


Running: dumpInitialNavigator
top
  127.0.0.1:8000
    devtools/resources
      inspected-page.html

Running: attachFrame
top
  127.0.0.1:8000
    devtools/resources
      inspected-page.html
  frame (magic-frame.html)
    127.0.0.1:8000
      devtools/bindings/resources
        magic-frame.html
        magic-script.js
        magic-style.css

Running: navigateFrame
top
  127.0.0.1:8000
    devtools/resources
      inspected-page.html
  frame (empty-frame.html)
    127.0.0.1:8000
      devtools/bindings/resource
        empty-frame.html