Emit browsingContext.fragmentNavigated event when traversing history

[sadym-chromium]

When traversing history, the browsing context is not supposed to be loaded, but the fragment should navigated instead.
test_traverse_history relies on the browsingContext.load, while it is not correct for normal URLs, not the data:text/html.
TODO:

• Emit browsingContext.fragmentNavigated.
• Change test_traverse_history to html fixture.