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This is to fix Deterministic Linux (dbg) builder.

Removed mini_installer.exe and previous_version_mini_installer.exe too.

Bug: 871760, 870584
Change-Id: Ieb85e844ceb9d5430f3870b26f98ffbe095ad539
Reviewed-on: https://chromium-review.googlesource.com/1165269
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581221}