Update DevTools DEPS (trusted)

Rolling build: https://chromium.googlesource.com/chromium/src/build/+log/959f536..73bc49d

Roll created at https://cr-buildbucket.appspot.com/build/8691884929256239073

Bug: none
Change-Id: I7cf51aa2c6c9444c7def6489c32f6e8a46c57275
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7509412
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': '959f536abb22a98dfbb4d70ed989b6ec0a51bb53',
+  'build_revision': '73bc49ded0de5ce2de9fb4e6aa8b1394368ec690',
 
   'buildtools_url': 'https://chromium.googlesource.com/chromium/src/buildtools.git',
   'buildtools_revision': '4dc32b3f510b330137385e2b3a631ca8e13a8e22',