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With NavigationMojoResponse (or the NetworkService), the
NavigationURLLoader implementation is no more the
NavigationURLLoaderImpl but the NavigationURLLoaderNetworkService. Some
NavigationURLLoader unittests needs to be rewritten.

This CL removes NavigationURLLoaderTest.RequestBlocked and adds
BrowserSideNavigationBrowserTest.RequestBlockedByResourceDispatcherHostDelegate.

Design doc: https://goo.gl/Rrrc7n (NavigationMojoResponse)

Bug: 705744
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I2c2788e25182d8c3302daf77557160fa57313b84
Reviewed-on: https://chromium-review.googlesource.com/867951
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533699}