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Breakpad supports product data values up to 2550 bytes long, so there is
no need for breadcrumbs to implement additional splitting internally.
This CL removes the code that splits breadcrumbs data across keys,
simplifies APIs around setting breadcrumbs, and removes any associated
unittests.

BUG=1068802

Change-Id: Ia33320bcbe69c799d62a2ef36cf0e4d11d9f4566
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2146932
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760122}