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This is a follow up to the changes in the interfaces: CL:2613848.

Remove launcher from BackgroundWindow and add launchFileManager() to
FileBrowserBackgroundFUll.

Move registerDialog() from BackgroundWindow to
FileBrowserBackgroundFUll.

Removed the class FileBrowserBackground and merged its content in
FileBrowserBackgroundFull.  This distinction it's only relevant for
other apps (Gallery, Audio and Video Players).  For Files app only the
"full" version is relevant.

NOTE: This file isn't checked by Closure compiler, so there is no
automatic check if these implementations adhere to the interface.

Test: Checked manually that loading the SWA doesn't produce any JS error
in the console.

Bug: 1113981
Change-Id: Ie0b792e7c88db908c2939723df14c7b713eddfe5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617407
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843272}