Build mac and linux release builds with symbols and don't strip them by default

Build mac and linux release builds with symbols and don't strip them by default

On Mac, we already build with symbols, but strip them.

Building with symbols (a) matches what we do for official builds and (b)
makes crashes on release builders more useful.

BUG=315598
R=erg@chromium.org, thakis@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=233887

[jochen (gone - plz use gerrit), 2013-11-07 18:55:36]

plz review

[Nico, 2013-11-07 21:49:47]

lgtm

[Elliot Glaysher, 2013-11-07 21:55:24]

lgtm

[commit-bot: I haz the power, 2013-11-08 07:47:55]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jochen@chromium.org/64753002/1

[commit-bot: I haz the power, 2013-11-08 08:03:59]

Step "update" is always a major failure.
Look at the try server FAQ for more details.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2013-11-08 08:56:14]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jochen@chromium.org/64753002/1

[jochen (gone - plz use gerrit), 2013-11-08 12:31:04]

Committed patchset #1 manually as r233887 (presubmit successful).