Add more GN deps to the build.

components/dom_distiller/content/BUILD.gn

+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+if (!is_ios) {
+  # GYP version: components/dom_distiller.gypi:dom_distiller_content
+  static_library("content") {
+    sources = [
+     "distiller_page_web_contents.cc",
+     "distiller_page_web_contents.h",
+     "dom_distiller_viewer_source.cc",
+     "dom_distiller_viewer_source.h",
+     "web_contents_main_frame_observer.cc",
+     "web_contents_main_frame_observer.h",
+    ]
+
+    deps = [
+      "//components/dom_distiller/core",
+      "//components/resources",
+      "//components/strings",
+      "//content/public/browser",
+      "//net",
+      "//skia",
+     #'../sync/sync.gyp:sync',  TODO(GYP)
+    ]
+  }
+}