Allow webrtc compilation with stlport

Android has not yet finalized its libc++ build. Allow compilation with
stlport by removing several C++11 library usages.

BUG=427718,487341,webrtc:4866
R=andrew@webrtc.org

Review URL: https://codereview.webrtc.org/1250663007 .

Patch from Jared Duke <jdduke@chromium.org>.

Cr-Commit-Position: refs/heads/master@{#9616}
1 file changed