Compile with enable_mdns by default on Windows and Linux

Compile with enable_mdns by default on Windows and Linux

This will compile MDns support by default on Windows and Linux. Note that this
is separate from actually enabling MDns, which will be gated by the
"--enable-device-discovery" flag.

BUG=233821
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=210906

[Vitaly Buka (NO REVIEWS), 2013-07-01 18:34:53]

lgtm

[gene, 2013-07-01 18:36:49]

lgtm

[szym, 2013-07-02 17:44:02]

lgtm

don't forget to set BUG=

[commit-bot: I haz the power, 2013-07-02 23:04:50]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/noamsml@chromium.org/18374002/1

[commit-bot: I haz the power, 2013-07-03 03:45:02]

Retried try job too often on win_x64_rel for step(s) compile
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_x64_re...

[commit-bot: I haz the power, 2013-07-03 17:49:53]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/noamsml@chromium.org/18374002/1

[commit-bot: I haz the power, 2013-07-04 02:30:32]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/noamsml@chromium.org/18374002/1

[commit-bot: I haz the power, 2013-07-04 03:55:23]

Sorry for I got bad news for ya.
Compile failed with a clobber build on win_x64_rel.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_x64_re...
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2013-07-04 05:31:19]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/noamsml@chromium.org/18374002/1

[commit-bot: I haz the power, 2013-07-04 06:19:32]

Sorry for I got bad news for ya.
Compile failed with a clobber build on win_x64_rel.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_x64_re...
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2013-07-04 07:10:26]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/noamsml@chromium.org/18374002/1

[commit-bot: I haz the power, 2013-07-04 08:12:18]

Sorry for I got bad news for ya.
Compile failed with a clobber build on win_x64_rel.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_x64_re...
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2013-07-04 14:41:06]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/noamsml@chromium.org/18374002/1

[commit-bot: I haz the power, 2013-07-04 14:54:34]

Sorry for I got bad news for ya.
Compile failed with a clobber build on win_x64_rel.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_x64_re...
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2013-07-04 18:16:09]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/noamsml@chromium.org/18374002/1

[commit-bot: I haz the power, 2013-07-04 19:40:42]

Sorry for I got bad news for ya.
Compile failed with a clobber build on win_x64_rel.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_x64_re...
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2013-07-10 16:02:47]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/noamsml@chromium.org/18374002/1

[Noam Samuel, 2013-07-10 16:02:59]

On 2013/07/04 19:40:42, I haz the power (commit-bot) wrote:
> Sorry for I got bad news for ya.
> Compile failed with a clobber build on win_x64_rel.
>
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_x64_re...
> Your code is likely broken or HEAD is junk. Please ensure your
> code is not broken then alert the build sheriffs.
> Look at the try server FAQ for more details.

Re-trying with https://codereview.chromium.org/18861007/ submitted.

[commit-bot: I haz the power, 2013-07-10 17:34:51]

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=linux_clan...

[commit-bot: I haz the power, 2013-07-10 17:36:53]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/noamsml@chromium.org/18374002/1

[commit-bot: I haz the power, 2013-07-10 19:21:07]

Change committed as 210906