Make Blink internal parts private dependencies.

third_party/WebKit/public/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.
 
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//tools/grit/grit_rule.gni")
 
 blink_headers_values = exec_script("//build/gypi_to_gn.py",
                                    [ rebase_path("blink_headers.gypi") ],
                                    "scope",
                                    [ "blink_headers.gypi" ])
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 # GYP version: WebKit/public/blink.gyp:blink
 group("blink") {
   public_deps = [
     ":blink_headers",
     ":blink_minimal",
+  ]
+  deps = [
     "//third_party/WebKit/Source/platform",
     "//third_party/WebKit/Source/web",
   ]
 }
 
 # This target provides a minimal set of Blink APIs such as WebString to use in
 # places that cannot link against the full Blink library.  FIXME: We really
 # shouldn't have this at all and should instead remove all uses of Blink's API
 # types from places that can't link against Blink. crbug.com/248653
 #
@@ skipping 151 matching lines @@
     "platform/modules/payments/payment_request.mojom",
   ]
 }
 
 group("generate_mojo_bindings") {
   deps = [
     ":mojo_bindings__generator",
     ":mojo_bindings_blink__generator",
   ]
 }