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This reverts commit 9b92a6a2.

Reason for revert: Multiple ExtensionsMenuViewBrowserTest cases failing on Linux bots.

Bug:1047630

Original change's description:
> Hide extensions container when none are installed
> 
> This change makes ExtensionsToolbarContainer invisible by default. It
> turns visible when any extension is added and goes invisible if the last
> extension is removed.
> 
> Bug: chromium:943702
> Change-Id: Ia64d8db55d3cd53beff450941d1b7d2cba282ca0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1956186
> Commit-Queue: Peter Boström <pbos@chromium.org>
> Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
> Reviewed-by: Caroline Rising <corising@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#737171}

TBR=rdevlin.cronin@chromium.org,pbos@chromium.org,corising@chromium.org

Change-Id: I012b5f1137c5af73af2cbe1ac2e4b0a123cd2759
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:943702
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032108Reviewed-by: Ioana Pandele <ioanap@chromium.org>
Commit-Queue: Ioana Pandele <ioanap@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737262}