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This rewrites histograms.xml to avoid text duplication.

Change-Id: I80ae3d3b7e6873c1d193ef4520d63fc3c6163982
Bug: None
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517594
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836566}