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This reverts commit 1ec12653.

Reason for revert: Likely to cause consistent failures in single_process_mash_interactive_ui_tests for linux-chromeos-dbg due to assertion failure from missing icon "cr:insert-drive-file".

Bug: 912678

Original change's description:
> Downloads: detect failed file icons and show default thumbnail
> 
> On the downloads page, we consult the system for a themed image for the
> type of file downloads. Ex: zip files -> archive icon.
> 
> When a system doesn't know why type of icon to show for a specific file
> type, it can either return a default or nothing. Right now, Linux
> returns nothing, so we show nothing.  chrome://fileicon tries to warn
> us by giving a network error (which has been ignored until now).
> 
> So, when a chrome://fileicon fails to load, show a default filetype
> icon in respond.
> 
> Before & after screenshots: https://imgur.com/a/txRbfIG
> 
> R=​dpapad@chromium.org
> BUG=855259
> 
> Change-Id: I370fd8ea119b194ad8e1ba7e0dfad32c6cea1bbe
> Reviewed-on: https://chromium-review.googlesource.com/c/1132560
> Commit-Queue: Dan Beam <dbeam@chromium.org>
> Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#614581}

TBR=dbeam@chromium.org,dpapad@chromium.org

Change-Id: I4ef27f132954754a80e3b3def4aadf5774b3875d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 855259
Reviewed-on: https://chromium-review.googlesource.com/c/1367933Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614713}