Move mojo/public/c/gpu/* to mojo/public/c/include.

examples/ui/spinning_cube/BUILD.gn

 # Copyright 2015 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/mojo_application.gni")
 
 mojo_native_application("spinning_cube") {
   output_name = "spinning_cube_view"
 
   sources = [
     "main.cc",
     "spinning_cube_app.cc",
     "spinning_cube_app.h",
     "spinning_cube_view.cc",
     "spinning_cube_view.h",
   ]
 
   deps = [
     "//base",
     "//examples/spinning_cube:lib",
     "//mojo/application",
     "//mojo/environment:chromium",
     "//mojo/gpu",
-    "//mojo/public/c/gpu",
+    "//mojo/public/c:gpu",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/environment",
     "//mojo/public/cpp/system",
     "//mojo/services/geometry/cpp",
     "//mojo/services/geometry/interfaces",
     "//mojo/services/gfx/composition/interfaces",
     "//mojo/services/input_events/interfaces",
     "//mojo/services/ui/input/interfaces",
     "//mojo/services/ui/views/interfaces",
     "//mojo/ui",
     "//mojo/ui:ganesh",
     "//mojo/ui:gl",
   ]
 }