Update DevTools DEPS (trusted-versions)
Update DevTools DEPS (trusted-versions)

Rolling third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/647cfe6..268d645

R=machenbach@chromium.org,liviurau@chromium.org

Bug: none
Change-Id: I62fbab2afa0ea37b7983caf9fc1688b43d6351c3
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3832468
Commit-Queue: Devtools Autoroller <075cca983f8f93eec1be8cf9702f03e09507e730@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Devtools Autoroller <075cca983f8f93eec1be8cf9702f03e09507e730@chops-service-accounts.iam.gserviceaccount.com>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend