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The problem was with the new CreateHangingFirstRequestInterceptor implementation for the network service case. Returning "true" from the URLLoaderInterceptor isn't enough to hang the frame request, as the URLLoaderClient interfaceptr's destruction will lead to an error in the renderer and an error page will commit. Prerendering code would then think that the prerender has committed and can be used.

Bug: 800373
Change-Id: Id5b8e20fcec8850b9b00d57cbae803102d95d59d
Reviewed-on: https://chromium-review.googlesource.com/857961Reviewed-by: Yuzhu Shen <yzshen@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#528355}