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This CL deletes FileProtocolHandler from net/, makes URLRequestFileJob
a test-only class (HTTP request mocks subclass it), and deletes
URLRequestFileDirJob and NetworkDelegate::CanAccessFile. File URLs are
now handled outside of the network service, so this code is no longer
being used.

This CL leaves in place net/directory_* files, which are used by the
new code (And should probably be moved somewhere more appropriate for
their new use, in another CL), and the network build option
disable_file_support, which should also be cleaned up when moving
those files.

TBR=seantopping@chromium.org

Bug: 934009
Change-Id: I2ef493849847adbb340a364de12ea41e91870b6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787187
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695192}