Revert "Report the number of files within ZIP file to SafeBrowsing"

This reverts commit e55866bf511763199ba1c49415fb71bbd7f54811.

Reason for revert: suspect non_single_process_mash_unit_tests failing on chromium.memory/Linux ChromiumOS MSan Tests

E.g.
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Linux%20ChromiumOS%20MSan%20Tests/11404
https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8920951203278062672/+/steps/non_single_process_mash_unit_tests/0/logs/FileAnalyzerTest.TypeInvalidZip__status_CRASH_/0


Original change's description:
> Report the number of files within ZIP file to SafeBrowsing
> 
> This CL adds code to count the number of files and directories within a
> ZIP archive and add it to download pings.
> 
> Bug: 926586
> Change-Id: I6cc48f6e02f7f5a8d99271f21bb7b0330070812c
> Reviewed-on: https://chromium-review.googlesource.com/c/1479585
> Reviewed-by: Varun Khaneja <vakh@chromium.org>
> Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
> Commit-Queue: Daniel Rubery <drubery@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#633969}

TBR=meacer@chromium.org,vakh@chromium.org,drubery@chromium.org

Change-Id: I19d08a66ae7b020e3999fb262df2cac9d74e6f39
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 926586
Reviewed-on: https://chromium-review.googlesource.com/c/1480360
Reviewed-by: Takashi Sakamoto <tasak@google.com>
Commit-Queue: Takashi Sakamoto <tasak@google.com>
Cr-Commit-Position: refs/heads/master@{#634069}
8 files changed