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

mojo/skia/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.
 
 source_set("skia") {
   sources = [
     "ganesh_context.cc",
     "ganesh_context.h",
     "ganesh_framebuffer_surface.cc",
     "ganesh_framebuffer_surface.h",
     "ganesh_image_factory.cc",
     "ganesh_image_factory.h",
     "ganesh_texture_surface.cc",
     "ganesh_texture_surface.h",
     "type_converters.cc",
     "type_converters.h",
   ]
 
   deps = [
     ":skia_bindings",
     "//base",
     "//mojo/gpu",
-    "//mojo/public/c/gpu",
-    "//mojo/public/c/gpu:MGL",
+    "//mojo/public/c:MGL",
+    "//mojo/public/c:gpu",
     "//mojo/services/geometry/interfaces",
     "//skia",
   ]
 }
 
 source_set("skia_bindings") {
   sources = [
     "gl_bindings_skia.cc",
     "gl_bindings_skia.h",
   ]
   deps = [
-    "//mojo/public/c/gpu",
-    "//mojo/public/c/gpu:GLES2",
+    "//mojo/public/c:GLES2",
+    "//mojo/public/c:gpu",
     "//skia",
   ]
 }