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[PM] Fix some flakiness in the PageNodeImplBrowserTest

Using an EmbeddedTestServer bound to a specific port is flaky because
it's not guaranteed that this port will be available when running the
test, switching to a URLLoaderInterceptor fix this.

Bug: 998071
Change-Id: Ieae65bb2e9a12f5e5cf3aaaa772667a1d0e2aef9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1779201Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692216}