Update V8 DEPS.

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/cc228ab..1748b43

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

Change-Id: I03b8c1bc81ab91e6fc13acd13c88f63c1b7150b3
Reviewed-on: https://chromium-review.googlesource.com/453019Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43731}

DEPS

@@ -8,7 +8,7 @@ vars = {
 
 deps = {
   "v8/build":
-    Var("chromium_url") + "/chromium/src/build.git" + "@" + "cc228aba0c2511ca3558b1675ab588808738f00d",
+    Var("chromium_url") + "/chromium/src/build.git" + "@" + "1748b434c77f774e6046d6cd721e7534a9643163",
   "v8/tools/gyp":
     Var("chromium_url") + "/external/gyp.git" + "@" + "e7079f0e0e14108ab0dba58728ff219637458563",
   "v8/third_party/icu":