Pull GN at r271709

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 91b10966a87390fcf431b833ee580ceea89b1060..22c9aa1020dbfeba2137c09e33cddaec850765f0 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -52,7 +52,9 @@ group("root") {
     "//third_party/smhasher:cityhash",
     "//third_party/smhasher:murmurhash3",
     "//third_party/smhasher:pmurhash",
-    "//third_party/WebKit/Source/platform",
+    # TODO(brettw) re-enable once the unused variables in this .gn file are
+    # fixed and rolled into Chrome.
+    #"//third_party/WebKit/Source/platform",
     "//third_party/WebKit/Source/wtf",
     "//third_party/zlib",
     "//third_party:jpeg",
@@ -79,7 +81,7 @@ group("root") {
       "//gpu/command_buffer/client",  # Needs Skia.
       "//net",
       "//third_party/libusb",
-      "//third_party/WebKit/Source/platform",
+      #"//third_party/WebKit/Source/platform",
       "//third_party/WebKit/Source/wtf",  # TODO(brettw) re-enable for Android.
       "//tools/gn",
       "//ui/base:ui_base",