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resource_map_source generates a map looking like

  { "IDR_FOO", IDR_FOO }

while resource_file_map_source generations a map looking like

  { "path/to/resource", IDR_FOO }

The latter currently doesn't work for files that contain variable references
in their name (e.g. ${root_gen_dir}).

The mojo code just needs any unique string identifier, so just use
resource_map_source instead.

No intended behavior change.

Bug: 899437
Change-Id: Ifc72086bd3b26997fb29d7d43306ba790a2c4e73
Reviewed-on: https://chromium-review.googlesource.com/c/1307937Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603965}