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This reverts commit 2ade99c3.

Reason for revert: Breaks compile on Closure_Compilation_Linux, see https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.fyi%2FClosure_Compilation_Linux%2F120458%2F%2B%2Frecipes%2Fsteps%2Fcompile%2F0%2Fstdout

Original change's description:
> Add TPM firmware update option to about page.
> 
> BUG=chromium:742985
> TEST=New webui test case in CrSettingsAboutPageTest.AboutPage
> 
> Change-Id: Ie5d5d4f61efb56aa8fe61988bfdbdc44450a34b7
> Reviewed-on: https://chromium-review.googlesource.com/678728
> Commit-Queue: Mattias Nissler <mnissler@chromium.org>
> Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#504315}

TBR=xiyuan@chromium.org,stevenjb@chromium.org,mnissler@chromium.org

Change-Id: I974a2ff1b144fc912444d41d98c6421270f81987
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:742985
Reviewed-on: https://chromium-review.googlesource.com/684374Reviewed-by: Mattias Nissler <mnissler@chromium.org>
Commit-Queue: Mattias Nissler <mnissler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504318}