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This reverts commit c513d32f.

Reason for revert: See internal b/124450506
Ultimately, this code gets bitten by these horrors:
https://codesearch.chromium.org/chromium/src/services/service_manager/embedder/set_process_title_linux.cc?q=process_title&sq=package:chromium&g=0&l=114

Original change's description:
> [fuchsia] Read the command-line from /data/cast/
> 
> The command-line will now be populated from
> /data/cast/castagent-command-line.
> 
> Bug: b/122267826
> Test: Add command-line to show verbose logging, cast_shell_unittests
> Change-Id: I741a1a32e59bea07a2ce857d24df57712cf32761
> Reviewed-on: https://chromium-review.googlesource.com/c/1396135
> Commit-Queue: Aidan Wolter <awolter@chromium.org>
> Reviewed-by: Wez <wez@chromium.org>
> Reviewed-by: Yuchen Liu <yucliu@chromium.org>
> Reviewed-by: Sergey Volk <servolk@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#625457}

TBR=wez@chromium.org,servolk@chromium.org,yucliu@chromium.org,awolter@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: b/122267826
Change-Id: I5ce28fa732ac6f1af8f3e19a51d66bceab081681
Reviewed-on: https://chromium-review.googlesource.com/c/1482135Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634513}