Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/169887d..59ac9bd

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

Change-Id: Ie5992189071dffe8b26ae4dc51741bc853de5892
Reviewed-on: https://chromium-review.googlesource.com/1113314
Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53999}

DEPS

@@ -12,7 +12,7 @@ vars = {
 
 deps = {
   'v8/build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + '169887d089f363d4ee7349c0753521437c7244e3',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + '59ac9bda0b8fd61f7bc016be2c0cf58f8c3f714d',
   'v8/tools/gyp':
     Var('chromium_url') + '/external/gyp.git' + '@' + 'd61a9397e668fa9843c4aa7da9e79460fe590bfb',
   'v8/third_party/depot_tools':