Adding PRESUBMIT check on google::protobuf
Adding PRESUBMIT check on google::protobuf

The goal is to avoid direct usage of google::protobuf.

It should only be used with a 'using' directive in the header file:
//webrtc/base/protobuf_utils.h.

BUG=webrtc:7340
NOTRY=True

Review-Url: https://codereview.webrtc.org/2753823003
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#17467}

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