Roll GYP for Windows 10 project generation.

BUG=angleproject:1004

Change-Id: Ide2f71f1aee70d0d962ff275ac9bd0f852b218ac
Reviewed-on: https://chromium-review.googlesource.com/271482
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>
diff --git a/DEPS b/DEPS
index 912021e..35d7668 100644
--- a/DEPS
+++ b/DEPS
@@ -1,6 +1,6 @@
 deps = {
   "third_party/gyp":
-      "http://gyp.googlecode.com/svn/trunk@1987",
+      "http://chromium.googlesource.com/external/gyp@9f594095c5b14f8bc518081a660e77890c294861",
 
   # TODO(kbr): figure out how to better stay in sync with Chromium's
   # versions of googletest and googlemock.