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We migrated into an inheritance based R.java files that means that each
R.java file has access to all resources without manually specifying each
resource individually. This means the extra_r_text_files option is no
longer needed/used since we no longer need to know exactly what is in
each R.java file separately.

Change-Id: I71ebabda0d998a53a0ae54b8a3fd6cd84311105d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2302933
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789316}