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With PlzNavigate the navigation starts in the browser, so LaunchAppWithUrl cancels the prerender before we get the PrerenderHostMsg_AddLinkRelPrerender IPC from the renderer. Fix this by noticing that the prerender was already cancelled when the IPC arrives.

This fixes
PlatformAppUrlRedirectorBrowserTest.PrerenderedClickInTabIntercepted
with PlzNavigate.

BUG=504347

Review-Url: https://codereview.chromium.org/2554573012
Cr-Commit-Position: refs/heads/master@{#437633}