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This CL adds an IPAddress class intended to replace the current IPAddressNumber typedef. The class wraps a std::vector<uint8_t> containing the actual IP address and exposes a couple of helper methods. This CL only introduces the new class and related tests.

BUG=496258

Review URL: https://codereview.chromium.org/1408803010

Cr-Commit-Position: refs/heads/master@{#363046}