Use a wrapper for creating binary NetLog values.

This renames the "hex_encoded_bytes" parameter to "bytes" (Base64 encoded).

The motivation is to move towards a consistent approach for how binary data is encoded.

Bug: 657115
Change-Id: I4762ee774682a0376979d779ac1faa177d2b8701
Reviewed-on: https://chromium-review.googlesource.com/c/1378845
Commit-Queue: Ryan Hamilton <rch@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616954}
8 files changed