Make *some* version of the Win GN build work.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index e2fdb39d5ee2ec7fa730985c109bf38fbc3b354b..a794373a4c71aee99f770694c39e4f27bed705d4 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -255,4 +255,67 @@ group("root") {
       "//device/usb",
     ]
   }
+
+  if (is_win) {
+    # TODO(GYP): Make these work.
+    deps -= [
+      "//apps",
+      "//ash",
+      "//chrome/browser",
+      "//chrome/browser/devtools",
+      "//chrome/common",
+      "//chrome/plugin",
+      "//chrome/renderer",
+      "//chrome/utility",
+      "//components:all_components",
+      "//cc",
+      "//cc/blink",
+      "//content",
+      "//content/shell:content_shell",
+      "//content/test:test_support",
+      "//device/bluetooth",
+      "//extensions/browser",
+      "//extensions/common",
+      "//extensions/common/api",
+      "//extensions/renderer",
+      "//gpu",
+      "//google_apis",
+      "//google_apis/gcm",
+      "//jingle:notifier",
+      "//media",
+      "//media/blink",
+      "//media/cast",
+      "//media/mojo",
+      "//mojo",
+      "//pdf",
+      "//ppapi:ppapi_c",
+      "//printing",
+      "//remoting/client/plugin",
+      "//sandbox",
+      "//storage/browser",
+      "//sync",
+      "//third_party/WebKit/public:all_blink",
+      "//third_party/angle:translator",
+      "//third_party/leveldatabase",
+      "//third_party/libjingle",
+      "//third_party/usrsctp",
+      "//third_party/webrtc",
+      "//ui/accessibility",
+      "//ui/app_list",
+      "//ui/aura",
+      "//ui/base",
+      "//ui/display",
+      "//ui/events",
+      "//ui/gfx",
+      "//ui/gl",
+      "//ui/keyboard",
+      "//ui/native_theme",
+      "//ui/snapshot",
+      "//ui/surface",
+      "//ui/views",
+      "//ui/views/controls/webview",
+      "//ui/web_dialogs",
+      "//ui/wm",
+    ]
+  }
 }