Revert of Change //build/config/compiler:optimize_max to use -O3. (patchset #1 id:1 of https://codereview.chromium.org/2048163002/ )

Reason for revert:
Reverting, this caused a size regression for cronet that is more important to them than any likely perf gains.

I'll re-land a different CL that's less broad.

Original issue's description:
> Change //build/config/compiler:optimize_max to use -O3.
>
> Certain components (e.g., v8) really want to be compiled with -O3,
> but the current ":optimize_max" setting just used -O2. Since "max"
> should theoretically mean "max", let's try making it be -O3 across
> the board and see what happens.
>
> [email protected]
> BUG=616031
>
> Committed: https://crrev.com/96a6dfa2c30ab9b22abd20c87ed0e0d6ae41c40e
> Cr-Commit-Position: refs/heads/master@{#398704}

[email protected],[email protected]
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=616031

Review-Url: https://codereview.chromium.org/2062433002
Cr-Commit-Position: refs/heads/master@{#399276}
1 file changed