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This reverts commit 7405f12a.

Reason for revert: <INSERT REASONING HERE>
This CL breaks ios_showcase_tests.
https://build.chromium.org/p/chromium.fyi/builders/EarlGreyiOS/builds/30194

Original change's description:
> Add AccessibilityCustomAction to ContentSuggestions
> 
> In order to have the feature accessible, all the actions using gestures
> (long press, swipe to dismiss) must have custom accessibility actions.
> Also adds action sheet to Read Later cells.
> 
> Bug: 749131
> Change-Id: I2c81f6443a49bdf0cdccc3ec747b0ffd42513ef1
> Reviewed-on: https://chromium-review.googlesource.com/593652
> Commit-Queue: Gauthier Ambard <gambard@chromium.org>
> Reviewed-by: Jean-François Geyelin <jif@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#490930}

TBR=jif@chromium.org,gambard@chromium.org

Change-Id: I805e907403106623dc9c67cc89ccbbc5546d0ee1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 749131
Reviewed-on: https://chromium-review.googlesource.com/596591Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Menglu Huang <huangml@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491088}