Update V8 DEPS.

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/66badbd..25c380c

TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org

Change-Id: Iaf3e13ec8f9174321c61016c622a046a71ef6335
Reviewed-on: https://chromium-review.googlesource.com/1214867
Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: V8 Autoroller <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#55747}

DEPS

@@ -15,7 +15,7 @@ deps = {
   'v8/build':
     Var('chromium_url') + '/chromium/src/build.git' + '@' + '0e1589b1669eb6f81a62c44d0e2b84a9c3b398e1',
   'v8/third_party/depot_tools':
-    Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + '66badbd1cb2847380255ba6842e776af216ef4af',
+    Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + '25c380cf9d2df4bb72fc63f7435346bc49f7720c',
   'v8/third_party/icu':
     Var('chromium_url') + '/chromium/deps/icu.git' + '@' + '7ca3ffa77d635e44b9735e1b54fb9c4da3b6c821',
   'v8/third_party/instrumented_libraries':