Update the version of symupload.exe to breakpad@860d7f5da18
Update the version of symupload.exe to breakpad@860d7f5da18

It's the version I'm updating to: https://chromium.googlesource.com/breakpad/breakpad/+/860d7f5da18

It seems to be fixing the issue that we're having in crbug.com/576298, there's
been a lot of bug fixes since the last time we've pushed a version of this
binary (1 year and 9 months ago !) and this version doesn't seem to have the
symbol upload that we're encountering on the official builders (with the 1GB
PDBs).

Is there any particular reason why we don't compile this binary during an
official build ? It'd be more secure than checking it in directly.

Once I've landed this I'll push the symbols for this binary to the symbol
server.

These binaries have been compiled with VS2013u5 and MSDIA 12.0

BUG=576298

Review URL: https://codereview.chromium.org/1578033002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#368880}

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