Roll Chromium build to fix undeclared argument in mac toolchain

We build mac target with a warning that v8_current_cpu is set as a
build argument but not declared, actually v8 is not imported here.
Fixed this in chromium build system and pick up the fix in Dawn.
See https://chromium-review.googlesource.com/c/chromium/src/+/1369645

Change-Id: I266650907dc2d290c92d425a9b9609bf14c1d36b
Reviewed-on: https://dawn-review.googlesource.com/c/3220
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Jiawei Shao <jiawei.shao@intel.com>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
diff --git a/DEPS b/DEPS
index 69deb4a..17a0b03 100644
--- a/DEPS
+++ b/DEPS
@@ -12,7 +12,7 @@
 deps = {
   # Dependencies required to use GN/Clang in standalone
   'build': {
-    'url': '{chromium_git}/chromium/src/build@2fb6537bf59c9c9a736997b8bd888ca0ecf54322',
+    'url': '{chromium_git}/chromium/src/build@e439f6082423106f1fe2afa7e22f8fd4c00691df',
     'condition': 'dawn_standalone',
   },
   'buildtools': {