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Chromium dropped support for macOS 10.9 but did not bump the
LSMinimumSystemVersion. The Info.plist key was tied to the
MACOSX_DEPLOYMENT_TARGET, but because there is still outstanding work to
update that, the value does not reflect the real requirement.

This introduces a new GN variable mac_min_system_version that is used
for the LSMinimumSystemVersion, so that it can be controlled
independently of the GN variable mac_deployment_target.

Bug: 806071, 841631, 848769
Test: Chromium.app/Contents/Info.plist has a LSMinimumSystemVersion of 10.10.0
Change-Id: I90f5393aeb411dca0ae4d53f03c882cc969f6912
Reviewed-on: https://chromium-review.googlesource.com/1082757Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563868}