Fix occurrences of const typed declaration without initialization

Fix occurrences of const typed declaration without initialization

This fixes compilation errors as the following:

error: constructor must explicitly initialize the const member

BUG=506663
R=aluebs@webrtc.org, tommi@webrtc.org

Signed-off-by: Eduardo Lima (Etrunko) <eduardo.lima@intel.com>;

Committed: https://crrev.com/894ad94302d311fd3f193080dd881a1a3439dbe3
Cr-Commit-Position: refs/heads/master@{#9538}

[tommi, 2015-07-03 08:38:59]

The CQ bit was checked by tommi@webrtc.org

[tommi, 2015-07-03 08:39:00]

lgtm

[commit-bot: I haz the power, 2015-07-03 08:39:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1222233002/1

[commit-bot: I haz the power, 2015-07-03 08:39:59]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-07-03 08:40:00]

Try jobs failed on following builders:
  linux_msan on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/linux_msan/builds/3510)
  mac_asan on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/mac_asan/builds/8189)
  mac_rel on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/mac_rel/builds/8336)
  mac_x64_gn_rel on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/mac_x64_gn_rel/builds/2806)
  mac_x64_rel on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/mac_x64_rel/builds/8069)

(exceeded global retry quota)

[eblima, 2015-07-03 11:58:29]

The CQ bit was checked by eblima@gmail.com

[eblima, 2015-07-03 11:58:29]

The patchset sent to the CQ was uploaded after l-g-t-m from tommi@webrtc.org
Link to the patchset: https://codereview.webrtc.org/1222233002/#ps20001 (title:
"rebase")

[commit-bot: I haz the power, 2015-07-03 11:58:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1222233002/20001

[commit-bot: I haz the power, 2015-07-03 11:59:13]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-07-03 11:59:14]

Try jobs failed on following builders:
  mac on tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/mac/builds/8508)

[eblima, 2015-07-03 13:18:19]

The CQ bit was checked by eblima@gmail.com

[eblima, 2015-07-03 13:18:20]

The patchset sent to the CQ was uploaded after l-g-t-m from tommi@webrtc.org
Link to the patchset: https://codereview.webrtc.org/1222233002/#ps40001 (title:
"rebase on top of webrtc tree")

[commit-bot: I haz the power, 2015-07-03 13:18:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1222233002/40001

[commit-bot: I haz the power, 2015-07-03 15:34:38]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-07-03 15:34:49]

Patchset 3 (id:??) landed as
https://crrev.com/894ad94302d311fd3f193080dd881a1a3439dbe3
Cr-Commit-Position: refs/heads/master@{#9538}

[aluebs-webrtc, 2015-07-06 19:22:25]

lgtm