Update DevTools DEPS.

Rolling build: https://chromium.googlesource.com/chromium/src/build/+log/0616471..5f609e7

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

Change-Id: I745b134a42b82ee9e9a9a5917d327ea49e82e379
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2539021
Reviewed-by: Devtools Autoroller <devtools-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Devtools Autoroller <devtools-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>

DEPS

diff --git a/DEPS b/DEPS
index b4c79f1..bdd3507 100644
--- a/DEPS
+++ b/DEPS
@@ -6,7 +6,7 @@
 
 vars = {
   'build_url': 'https://chromium.googlesource.com/chromium/src/build.git',
-  'build_revision': '0616471e43426f56dce52d548ea743bfb920600c',
+  'build_revision': '5f609e7df2f7d443fb7eb4df4b600e739449d976',
 
   'buildtools_url': 'https://chromium.googlesource.com/chromium/src/buildtools.git',
   'buildtools_revision': '6302c1175607a436e18947a5abe9df2209e845fc',