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 ◑ Install upstream emscripten at version 1.38.33 (git hash 7e841b5)
 ◑ Pull upstream android.googlesource.com PIEX (git hash 6672dab)
 ◑ % make clean && make, run tests PASS
 ◑ Binary size: reduced by 1.3 kByte
 ◑ Assess performance: unchanged

Test: browser_tests --gtest_filter="QuickView*FilesAppBrowserTest*"
Bug: 1132695

Change-Id: I52787b1b9ac31a927899672261895037e8cc3bbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2460570Reviewed-by: Alex Danilo <adanilo@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815044}