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This reverts commit 4eb9ce3d.

Reason for revert: Compile error: Moved file (e.g., vector_icons.cc.template) needs to have #include updated as well.

Original change's description:
> Move shortcut viewer to ash/
> 
> Next step:
> * Consolidate string grd file into single shortcut_viewer_strings.grd
> * Remove NewWindowDelegate::ShowKeyboardShortcutViewer
>   and open it directly.
> * Remove KSV_EXPORT
> 
> Bug: 1046624
> 
> Change-Id: I4241bd00d5c27520ac11c09e7264e8c8c9729a84
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065852
> Commit-Queue: Mitsuru Oshima (OOO) <oshima@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Reviewed-by: James Cook <jamescook@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#743191}

TBR=jamescook@chromium.org,oshima@chromium.org,thakis@chromium.org,wutao@chromium.org

Change-Id: I1de5281e9e8ff07850b200dc798d27e0b0b340cb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1046624
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067245Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743214}