Fix archiving and running Chromium.app on OSX with target chrome_run.

Fix archiving and running Chromium.app on OSX with target chrome_run.

All the necessary files, like resources.pak and ffmpegsumo.so, are already
mapping deep inside Chromium.app/. Mapping the ones in PRODUCT_DIR is useless.

Technically, Chromium.dmg could be used but it's harder to start from the
command line, and mapping each individual files permits caching modules that
haven't changed, like the resource files.

TBR=csharp@chromium.org
BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=195351

[commit-bot: I haz the power, 2013-04-19 19:17:20]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/maruel@chromium.org/14109022/1

[commit-bot: I haz the power, 2013-04-19 22:27:32]

Retried try job too often on mac_rel for step(s) sync_integration_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[commit-bot: I haz the power, 2013-04-20 00:10:12]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/maruel@chromium.org/14109022/1

[commit-bot: I haz the power, 2013-04-20 00:55:16]

Change committed as 195351

[csharp, 2013-04-22 14:51:52]

lgtm