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Previously, WebView would explicitly post onPageStarted for
loadDataWithBaseUrl, since this navigation was handled by blink and it
did not generate the event.

With browser-side navigation (PlzNavigate), this is no longer the case
and the navigation code will post this event under the normal pipeline.
For this reason, we need to disable the extra postOnPageStarted when
browser-side is turned on.

As part of the implementation, this adds a Java wrapper around
IsBrowserSideNavigationEnabled.

This also modifies an integration test to check that we only get
onPageStarted called once.

Bug: 702785
Test: run_webview_instrumentation_test_apk -f LoadDataWithBaseUrlTest#testloadDataWithBaseUrlCallsOnPageStarted
Change-Id: I3abc7b3503feee26e5b2438f9b039be30750e4ef
Reviewed-on: https://chromium-review.googlesource.com/683634Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504441}