Remove DISALLOW_COPY_AND_ASSIGN from MinidumpStreamInfo
Remove DISALLOW_COPY_AND_ASSIGN from MinidumpStreamInfo

DISALLOW_COPY_AND_ASSIGN was inadvertently added to
Minidump::MinidumpStreamInfo in f04a010f71f6, but this class is used as
the value side of the Minidump::stream_map_ map and must be copyable
(with an old enough C++ library).

This broke:

https://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_chromeos_rel_ng/builds/247141/steps/compile%20%28with%20patch%29/logs/stdio

TBR=ivanpe@chromium.org

Review URL: https://codereview.chromium.org/2158423003 .

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