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This reverts commit e80df6f2.

Reason for revert: seems to have broken builder "Network Service Linux"

Original change's description:
> [Extensions] Revert changes to icon loading JS function.
> 
> Bug: 1049214
> Change-Id: I64018260d06070da03821bbcb72578de62359be3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2042313
> Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
> Commit-Queue: David Bertoni <dbertoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#739076}

TBR=lazyboy@chromium.org,dbertoni@chromium.org

Change-Id: I4cf9a417bdf5b13aad77d6a4cb054a27dbe6a42f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1049214, 1049467
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2043003Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Commit-Queue: Carlos Knippschild <carlosk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739198}