Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/eb61983..79e2191

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

Change-Id: I268f52fbf24db332be534983f49dac7ace14ac09
Reviewed-on: https://chromium-review.googlesource.com/c/1450788Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#59310}

DEPS

@@ -16,7 +16,7 @@ vars = {
 
 deps = {
   'v8/build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + 'eb6198331cdc3c2cc8967a38f9096128c7ae1107',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + '79e2191d52c3618743a47cd8d99a23d6e5472745',
   'v8/third_party/depot_tools':
     Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + 'a1fbdff17736899759ae1d320ac684122bef21bd',
   'v8/third_party/icu':