Move Cookie exception histogram config entries out of internal file
Move Cookie exception histogram config entries out of internal file

Currently the configuration entries of site setting exception metrics are in
internal google3 histogram.xml file.

Move them out to the public one.

Review URL: https://codereview.chromium.org/1879963002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#386829}

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