Eliminate third_party/mojo/src from all targets' include paths

mojo/common/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("//testing/test.gni")
 
 group("common") {
   public_deps = [
     ":common_base",
     ":url_type_converters",
@@ skipping 13 matching lines @@
     "data_pipe_utils.cc",
     "data_pipe_utils.h",
     "user_agent.cc",
     "user_agent.h",
     "weak_binding_set.h",
     "weak_interface_ptr_set.h",
   ]
 
   defines = [ "MOJO_COMMON_IMPLEMENTATION" ]
 
+  public_deps = [
+    "//third_party/mojo/src/mojo/public/cpp/system",
+  ]
+
   deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
     "//mojo/environment:chromium",
     "//mojo/message_pump",
     "//third_party/mojo/src/mojo/public/c/system:for_component",
     "//third_party/mojo/src/mojo/public/cpp/bindings",
     "//third_party/mojo/src/mojo/public/cpp/environment",
-    "//third_party/mojo/src/mojo/public/cpp/system",
   ]
 }
 
 # GYP version: mojo/mojo_base.gyp:mojo_url_type_converters
 source_set("url_type_converters") {
   sources = [
     "url_type_converters.cc",
     "url_type_converters.h",
   ]
 
@@ skipping 35 matching lines @@
   ]
 
   sources = [
     # The message_pump tests are so small and some what related to this code
     # that we put them here.
     "../message_pump/handle_watcher_unittest.cc",
     "../message_pump/message_pump_mojo_unittest.cc",
     "common_type_converters_unittest.cc",
   ]
 }