Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/506800f..1fd2d08

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

Change-Id: I1461e1e9c839a717d307eb51b79f49ecf4f45616
Reviewed-on: https://chromium-review.googlesource.com/1046246
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53011}

DEPS

@@ -12,7 +12,7 @@ vars = {
 
 deps = {
   'v8/build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + '506800f4cea285ae0cf22221c8a515890a862694',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + '1fd2d08a6f951a6a57ca175c75ca29740003fbf0',
   'v8/tools/gyp':
     Var('chromium_url') + '/external/gyp.git' + '@' + 'd61a9397e668fa9843c4aa7da9e79460fe590bfb',
   'v8/third_party/icu':