Move third_party/mojo/src/mojo/public to mojo/public

mojo/gpu/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.
 
 source_set("mojo_gles2_implementation") {
   sources = [
     "mojo_gles2_impl_autogen.cc",
     "mojo_gles2_impl_autogen.h",
   ]
 
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   deps = [
     "//base",
     "//gpu/command_buffer/client:gles2_interface",
-    "//third_party/mojo/src/mojo/public/c/gles2",
+    "//mojo/public/c/gles2",
   ]
 }