Remove a superfluous qualifier on an inline method.

Remove a superfluous qualifier on an inline method.

Fixes
..\..\third_party\webrtc/base/stringutils.h(295,49) :  warning(clang): extra qualification on member "empty_str" [-Wmicrosoft]

No behavior change, but makes the code more standards-conformant.

BUG=chromium:505296
Committed: https://crrev.com/97f44e1bf6ea116fff03bc204c305fffeb08467f
Cr-Commit-Position: refs/heads/master@{#9562}

[Nico, 2015-07-09 22:26:25]

thakis@chromium.org changed reviewers:
+ henrika@chromium.org, sergeyu@chromium.org

[Nico, 2015-07-09 22:26:25]

first to stamp wins!

[Sergey Ulanov, 2015-07-09 22:39:24]

lgtm

[Nico, 2015-07-09 22:40:15]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2015-07-09 22:40:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1228193002/1

[commit-bot: I haz the power, 2015-07-09 23:46:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-09 23:46:07]

Patchset 1 (id:??) landed as
https://crrev.com/97f44e1bf6ea116fff03bc204c305fffeb08467f
Cr-Commit-Position: refs/heads/master@{#9562}