DevTools: Remove binding of F12 key to Focus Debuggee command
DevTools: Remove binding of F12 key to Focus Debuggee command

Devtools keybindings to Actions are not disabled when the associated
command is disabled. The recently added Focus Debuggee command used F12
as a key binding but this had undesirable behavior when the DevTools
were docked in the browser window. This CL removes the F12 key binding.

Bug: 821285
Change-Id: I6acd66e01ba9a8ef3a8a082bd18e7da569ff347f
Reviewed-on: https://chromium-review.googlesource.com/1010469
Commit-Queue: Pavel Feldman <e1161d7019a0d5c7981e3c3ffc69c76f4b09679a@chromium.org>
Reviewed-by: Pavel Feldman <e1161d7019a0d5c7981e3c3ffc69c76f4b09679a@chromium.org>
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#550328}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: b0f3a6bd2b46f98007eedf120865687f7b104311
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