Revert of Bump Chrome's deployment target to macOS 10.8. (patchset #2 id:20001 of https://codereview.chromium.org/2420233002/ )

Reason for revert:
This CL seems to break a number of layout tests on Mac bots. Most of them probably just needs an expectation update.

The error logs are available here:
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.9/builds/38229
https://storage.googleapis.com/chromium-layout-test-archives/WebKit_Mac10_9/38229/layout-test-results/results.html

Original issue's description:
> Bump Chrome's deployment target to macOS 10.8.
>
> I also updated the comment to better reflect the relationship between Chrome and
> its dependencies. Several Chrome dependencies require a different min sdk and/or
> deployment target from Chrome.
>
> BUG=622481
>
> Committed: https://crrev.com/3dade40fe88881864a42134f92238a6d292d8505
> Cr-Commit-Position: refs/heads/master@{#425870}

TBR=thakis@chromium.org,erikchen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=622481

Review-Url: https://codereview.chromium.org/2426673003
Cr-Commit-Position: refs/heads/master@{#425910}
1 file changed