Update DevTools DEPS.
Update DevTools DEPS.

Rolling build: https://chromium.googlesource.com/chromium/src/build/+log/6b650a6..bc21621

Rolling buildtools/linux64: git_revision:e0c476ffc83dc10897cb90b45c03ae2539352c5c..git_revision:72d5a6e15d868abc8451fe0a3b6596e86a2ffc40

Rolling third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/ecdc362..e319aba

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

Bug: none
Change-Id: I85bc93fbfddce56eb772d0e234665d7d7cde8508
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2965768
Reviewed-by: Devtools Autoroller <075cca983f8f93eec1be8cf9702f03e09507e730@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: 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