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This is a reland of 99d553b3

This was reverted due to timeouts waiting for the Web Assembly
module to load on debug builds. The test has now been disabled
for that configuration.

Original change's description:
> pdf: Switch to the threaded version of ink
>
> Updates the resource manager to not require a mime type when loading
> a bundled resource. This is the same as the behavior in [1].
>
> [1] https://cs.chromium.org/chromium/src/extensions/browser/extension_protocols.cc?q=extension_protocols.cc&sq=package:chromium&dr&l=340
>
> Bug: 902646
> Change-Id: Ib65eafd6fc900351a9270317a711c9d3ab092f80
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1501194
> Commit-Queue: dstockwell <dstockwell@chromium.org>
> Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#638324}

Bug: 902646
Change-Id: I9fa70cad6892a24185e12b7cd72f46773a98a8a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1508433
Auto-Submit: dstockwell <dstockwell@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: dstockwell <dstockwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638713}