Update DevTools DEPS (trusted)

Rolling build: https://chromium.googlesource.com/chromium/src/build/+log/9b7e5bb..ae9abab

Roll created at https://cr-buildbucket.appspot.com/build/8685633738214635025

Bug: none
Change-Id: Ib62671d8457e03f260c7f2e00c36d6e36bf5dda2
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7722884
Commit-Queue: Devtools Autoroller <devtools-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Devtools Autoroller <devtools-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>

Author: devtools-ci-autoroll-builder

DEPS

@@ -12,7 +12,7 @@ vars = {
   'build_with_chromium': False,
 
   'build_url': 'https://chromium.googlesource.com/chromium/src/build.git',
-  'build_revision': '9b7e5bb55b71044930fcf31b3fe531ad63151813',
+  'build_revision': 'ae9abab4132351bb4bddb5afd875e5f4accf65f2',
 
   'buildtools_url': 'https://chromium.googlesource.com/chromium/src/buildtools.git',
   'buildtools_revision': '22e55595e15ebbbbb4bef118d5a654b185b0b30d',