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Follow the lead of other DevUI pages, and move WebRTC internals
resources (those used in chrome://webrtc-internals) into the DFM. This
removes ~25 KB from the main .pak file on Android.

Bug: 927131
Change-Id: Ia243ec46e728a711cc7c3bb8df10cb661300d1a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869014Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709092}