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This patch erases lines from the log file that Breakpad uses to record
crashes that fall within the history clear range. This file is used on
Linux, Android, and Chrome OS, and may be present even when the data in
the file does not show up in chrome://crashes.

Bug: 825994
Change-Id: I41f73ec9698398923fe67ed14c703375a9f046f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1460065Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#646506}