the coupling between our code and the //third_party/protobuf. This includes using typedefs to define strings instead of assuming std::string. After this refactoring it will be possible to link with other protobuf implementations than the current one. We moved the PRESUBMIT check to another CL [1]. The goal of this presubmit is to avoid the direct usage of google::protobuf outside of the webrtc/base/protobuf_utils.h header file. [1] - https://codereview.webrtc.org/2753823003/ BUG=webrtc:7340 NOTRY=True Review-Url: https://codereview.webrtc.org/2747863003 Cr-Commit-Position: refs/heads/master@{#17466}