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This reverts commit 2c7a71c3.

Reason for revert: Linux with chunk size 50 broke in v8 which we
can't quickly fix, and Windows (chunk size 8) has a DWORD logging
error that looks non-trivial. We need to fix those before landing
this.

Original change's description:
> jumbo: stable assignment of inputs to chunks
> 
> Adding or removing a file from a jumbo source set causes on average
> half of the chunks to have their inputs reallocated.
> Derive chunk boundaries from a combination of list position and path
> content. This is so that when a file is added or removed, only the
> boundaries with adjacent chunks typically move.
> For a balance between maximum chunk size and stability of partitions:
> * Partition uniformly into the required number of chunks.
> * Pick a "center" from each chunk by minimum hash value.
> * Pick the boundaries between centers by maximum hash value.
> 
> Bug: 782863
> Change-Id: Ie71d82b132e8145b4ed3d1141f85886a12149d5a
> Reviewed-on: https://chromium-review.googlesource.com/1102218
> Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
> Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> Reviewed-by: Daniel Bratell <bratell@opera.com>
> Commit-Queue: Dirk Pranke <dpranke@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#570623}

TBR=dpranke@chromium.org,bratell@opera.com,brucedawson@chromium.org,david.barr@samsung.com

Change-Id: I8c81aca34ab2876aebea6b54e847cb24be3aa27f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 782863
Reviewed-on: https://chromium-review.googlesource.com/1116658Reviewed-by: Daniel Bratell <bratell@opera.com>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#570701}