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Add MYFILES_VOLUME_ENABLED in private strings to be able to have the
feature flag in the JS/UI code.

Change VolumeManager to use MyFiles folder for Downloads volume, the
method |GetMyFilesFolderForProfile| takes care of returning the right
value based on the feature flag MyFilesVolume.

Change NavigationListModel to support MyFiles as Volume when
MyFilesVolume feature flag is enabled:
1. MyFiles volume is the Downloads volume (after the feature flag is
removed we can rename it accordingly). Setup Downloads volume as
VolumeEntry,
2. Create a NavigationModelFakeItem with "My files" label, based on the
VolumeEntry (step #1).
3. Skip adding "Downloads" to Myfiles, since now MyFiles is in fact
Downloads volume.
4. Continue to add Linux and Play files to Myfiles.

Test: unit_tests --gtest_filter='VolumeManagerTest.GetVolumeListMyFilesVolume' and browser_test --gtest_filter='FileManagerJsTest.DirectoryTreeTest:FileManagerJsTest.NavigationList*'
Bug: 873539
Change-Id: Ia242d52a1e4d7b4fb3c7ca219d9cfdc4fce72543
Reviewed-on: https://chromium-review.googlesource.com/c/1308235
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604143}