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if the navigation is browser-initiated. The "stay in current
process to prevent privilege escalation" strategy is only valid
when the navigation was initiated by that process.

(As an aside, it is worth pointing out that current_frame_host is
not necessarily the initiator process.)

This change prevents a CheckWebUIRendererDoesNotDisplayNormalURL browser
crash in the scenario where the current page is chrome://settings, and
the user types in an URL that happens to be blocked by a
NavigationThrottle. This scenario starts being possible once
ExtensionNavigationThrottle starts doing more aggressive blocking of
top-level navigations.

BUG=661324
TEST=ToolbarModelTest.ShouldDisplayURL
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2884123002
Cr-Commit-Position: refs/heads/master@{#472303}