jbauch 083b73fb95 Use std::string references instead of copying contents.
This CL improves the memory footprint a bit by using string references
instead of creating a copy.

Review URL: https://codereview.webrtc.org/1241973002

Cr-Commit-Position: refs/heads/master@{#9592}
2015-07-16 09:46:43 +00:00
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