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Add a new value to OmniboxFocusType called DELETED_PERMANENT_TEXT,
which corresponds to the Ctrl+L, and then Backspace case.

This CL also breaks OmniboxFocusType out of template_url.h, into its
own header file.

This is because we plan to use OmniboxFocusType within
AutocompleteInput in the next CL, to replace the from_omnibox_focus()
boolean with this multi-valued enum.

Bug: 1106096
Change-Id: I2ef25083845d272fd934adafa66624de85d84cb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341399Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796048}