libwebp,DIR_METADATA: update component

"Blink>Image" -> "Internals>Images>Codecs"

+ add team email

Bug: 1170906
Change-Id: I470e2b927e3c56dadd450c38843e47af0048625f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2657580


Reviewed-by: Fredrik Söderquist <fs@opera.com>
Commit-Queue: James Zern <jzern@google.com>
Cr-Commit-Position: refs/heads/master@{#848824}