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[Cleanup] Use WebContentsConsoleObserver in NavigationBrowserTests

Update NavigationBrowserTests to use WebContentsConsoleObserver
instead of ConsoleObserverDelegate. This allows us to observe
console messages added without overriding the existing delegate of the
WebContents. Additionally, we no longer have to worry about the lifetime
of the observer (since it handles its own cleanup), so these can be
properly scoped.

Bug: 1034150
Change-Id: Idf52898484da7e5ec3fd0d3210580acba8294096
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1983591Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729546}