Fix ODR violations caused by mojoms being included in multiple components.

device/generic_sensor/public/cpp/BUILD.gn

 # Copyright 2016 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.
 
 component("cpp") {
   sources = [
     "platform_sensor_configuration.cc",
     "platform_sensor_configuration.h",
     "sensor_reading.cc",
     "sensor_reading.h",
   ]
 
-  defines = [ "DEVICE_GENERIC_SENSOR_IMPLEMENTATION" ]
+  defines = [ "DEVICE_GENERIC_SENSOR_PUBLIC_IMPLEMENTATION" ]
+
+  public_deps = [
+    "//device/generic_sensor/public/interfaces",
+  ]
 
   deps = [
     "//base",
     "//device/base/synchronization",
-    "//device/generic_sensor/public/interfaces",
   ]
 }