GN: Synchronize resources between Android and iOS.

iOS tests packaged into an .app uses the same way of
defining resources (the data attribute). Some iOS
simulator tests are failing due to missing resources, so
let's sync them all.

BUG=webrtc:5949
NOTRY=True

Review-Url: https://codereview.webrtc.org/2277753003
Cr-Original-Commit-Position: refs/heads/master@{#13898}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 28a0ffdd52d9ea0063c8344881f909832796e1e0
7 files changed