GitLab

Cause of revert: The previous CL tried to add a key to
accelerators_cocoa.mm without adding to menu item
Solution: remove change in accelerators_cocoa.mm but keep the change in
global_keyboard_shortcuts_mac.mm

This is a reland of 9b3d32d9

Original change's description:
> Tab Search: Setup keyboard shortcut
>
> Setup ctrl(cmd on Mac) + shift + e as tab search keyboard shortcut
> for all desktop platforms
>
> Bug: 1099917,1112558
> Change-Id: I6c50b26714d678d0f89d2c846909ff0b802e4f0d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2329944
> Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Robert Liao <robliao@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#795750}

Bug: 1099917
Bug: 1112558
Change-Id: I4639649e6b0b839ead06aac1458c058f20db5fca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343300Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796584}