Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/3f61809..81ffd00

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/93cd73d..af0ede1

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

Change-Id: I4d9b172f6657d33629a021475290869f743c5482
Reviewed-on: https://chromium-review.googlesource.com/c/1330911
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#57415}

DEPS

@@ -13,9 +13,9 @@ vars = {
 
 deps = {
   'v8/build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + '3f61809684e8c546f949d5bbeb070f76a11f6924',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + '81ffd00401995c9ae0b99557b82e319a2a0498d1',
   'v8/third_party/depot_tools':
-    Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + '93cd73d98000ecdad2c478b30959854347091217',
+    Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + 'af0ede1e73a70aaa438b507333e867163f81cf9c',
   'v8/third_party/icu':
     Var('chromium_url') + '/chromium/deps/icu.git' + '@' + '45f655f2feb7069a7b9b47d1b1a596807bfd4220',
   'v8/third_party/instrumented_libraries':