Cleanup return values in chrome/browser/net

Cleanup return values in chrome/browser/net

This CL turns const by value return values into const by ref.

Replacing const value by a const ref when a member variable is returned
is safe, because the member variable will live at least as long as the
temporary object returned now. It can also be more efficient, because
returning a ref can spare copying.

BUG=393155
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=285669

[lucinka.brozkova, 2014-07-25 19:05:16]

Hi mmenke@,

Could you please do an OWNERS review?

Thank you.

Lucie

[mmenke, 2014-07-25 19:10:02]

LGTM

[lucinka.brozkova, 2014-07-25 19:11:16]

The CQ bit was checked by lucinka.brozkova@gmail.com

[commit-bot: I haz the power, 2014-07-25 19:14:46]

CQ is trying da patch. Follow status at

https://chromium-status.appspot.com/cq/lucinka.brozkova@gmail.com/420603008/2...

[commit-bot: I haz the power, 2014-07-25 20:00:08]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_chromium_rel_swarming on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_rel_sw...)

[mmenke, 2014-07-25 20:03:08]

On 2014/07/25 20:00:08, I haz the power (commit-bot) wrote:
> FYI, CQ is re-trying this CL (attempt #1).
> The failing builders are:
>   linux_chromium_rel_swarming on tryserver.chromium
>
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_rel_sw...)

I've been seeing that error on the bots all day - nothing to do with your CL.

[commit-bot: I haz the power, 2014-07-25 20:42:44]

Change committed as 285669