Fix style on network details to put scrollbar in tab contents.

Fix style on network details to put scrollbar in tab contents.

Make internet details tab contents flexible size and move header of network details out of content-area.

BUG=118126
TEST=Open network details, scale down browser until you see a scrollbar. This scrollbar will be within the tab's contents.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=127533

[flackr, 2012-03-16 19:14:37]

PTAL, I think we should move the tabstrip styles in network details to apply
more generally but that can be a separate CL / bug. Thanks!

[James Hawkins, 2012-03-18 02:44:27]

lgtm

[commit-bot: I haz the power, 2012-03-19 13:39:40]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/flackr@chromium.org/9701111/3002

[commit-bot: I haz the power, 2012-03-19 13:41:22]

Try job failure for 9701111-3002 on android for step "update".
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=android&nu...

Step "update" is always a major failure.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2012-03-19 17:44:06]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/flackr@chromium.org/9701111/9001

[commit-bot: I haz the power, 2012-03-19 20:02:29]

Try job failure for 9701111-9001 (retry) on win_rel for step "browser_tests".
It's a second try, previously, step "browser_tests" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...