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This reverts commit 402e8644.

Reason for revert: This changes caused an new bug and a perf regression on startup. 

Back it out for now, and will try to fix the original bug appropriately later.

Original change's description:
> WebApps: Remove install pwa icon from toolbar when page crashed
> 
> This change 1. hides the install pwa page action icon in the toolbar
> 2. grayed out "create shortcut" and "Install {pwaName}" menu items
> when page crashed.
> 
> Bug: 1057526, 1059934, 1059172
> 
> Change-Id: I63d5e3607e9aff71ab2bd799d792f025b142ec42
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2078771
> Commit-Queue: Junyi Xiao <juxiao@microsoft.com>
> Reviewed-by: Peter Kasting <pkasting@chromium.org>
> Reviewed-by: Alan Cutter <alancutter@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#746305}

TBR=pkasting@chromium.org,alancutter@chromium.org,mjackson@microsoft.com,lomitch@microsoft.com,juxiao@microsoft.com,sunggch@microsoft.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1057526
Change-Id: I69d4e20f4b50c12a56abade08eaf0843c3764d08
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2097540
Commit-Queue: Lorne Mitchell <lomitch@microsoft.com>
Reviewed-by: Lorne Mitchell <lomitch@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#749294}