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After a recent refactor, [cmd + left arrow] would perform history navigation
instead of moving the cursor to the beginning of the Omnibox. This happens
because the processing for the hotkey [triggering history navigation] has higher
priority than the typical event handling flow.

The hotkeys [cmd + left arrow] and [cmd + right arrow] are special, and should
only trigger if the firstResponder is a WebContents, and the WebContents has
chosen not to process the event.

This CL removes handleExtraKeyboardShortcut:, which was dead code.

Bug: 852332
Change-Id: Id03f5e22337a79d9ca4abfd20d995a8cf8976b2a
Reviewed-on: https://chromium-review.googlesource.com/1099648Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567315}