Removes IsolatedFileSystemEntry in favor of working with base::FilePath.

This means NativeFileSystemManager is the sole entry point for creating
NativeFileSystemEntries, which should make it easy to reuse for
FileHandling and LaunchEvents.

Bug: 829689
Change-Id: I47bd78e6558bfe2907ee03261da9ce7da1272f9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1621410
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661893}
5 files changed