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This reverts commit 5528fce5.

Reason for revert: Compile failure on:

https://ci.chromium.org/p/chromium/builders/ci/win-archive-rel/16199?

Original change's description:
> Read attachments from introduction
> 
> Reads text and file attachments from introduction frame and appends
> them to the share target.
> 
> Bug: 1085068
> Change-Id: I0198a9edcfa5d8c7691514072c50577ff3d72428
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320599
> Commit-Queue: Himanshu Jaju <himanshujaju@chromium.org>
> Reviewed-by: Alex Chau <alexchau@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#793136}

TBR=alexchau@chromium.org,himanshujaju@chromium.org

Change-Id: I4fbdac65b9e62653068572eaade6b920d949b9df
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1085068
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2329591Reviewed-by: Balazs Engedy <engedy@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793139}