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Change EntryList method from children to use getUIChildren so it has
the same API as VolumeEntry.

Change util.isDescendantEntry to check getUIChildren for EntryList and
VolumeEntry if the filesystem of both entris are different. These 2
types contain entries with different filesystem thus we should check
those.

Add toEntryList helper just to be able to check that an entry has the
method getUIChildren without closure complaining that Entry and
FilesAppEntry don't have such attribute, this method is only available
in EntryList and VolumeEntry.

Change directory_tree EntryListItem to add the volume type attribute
to have it compatible with and without MyFilesVolume flag.

Change file_display.js selector to use volume-type-icon makes downloads
folder selector compatible with/without MyFilesVolume flag.

Change FileManager to check if MyFiles actually exist before assigning
to nextCurrentDirEntry, this happens if MyFiles is a volume and isn't
mounted. Also in this condition (MyFiles being a volume but not
mounted) change NavigationListModel to create a EntryList for MyFiles
so it can display Linux or Play files if they exist.

before this change.

Test: Enabled a few tests with MyFilesVolume flag that were broken
Bug: 873539
Change-Id: I66d2b95d5ea5897c2f2db558f46b0bcfcfd0c900
Reviewed-on: https://chromium-review.googlesource.com/c/1345708
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610505}