Switch to standard integer types in mojo/.

mojo/public/platform/native/gles2_impl_thunks.cc

 // 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.
 
 #include "mojo/public/platform/native/gles2_impl_thunks.h"
 
 #include <assert.h>
+#include <stddef.h>
 
 #include "mojo/public/platform/native/thunk_export.h"
 
 extern "C" {
 static MojoGLES2ImplThunks g_impl_thunks = {0};
 
 #define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) \
   ReturnType GL_APIENTRY gl##Function PARAMETERS {                 \
     assert(g_impl_thunks.Function);                                \
     return g_impl_thunks.Function ARGUMENTS;                       \
   }
 #include "mojo/public/c/gles2/gles2_call_visitor_autogen.h"
 #undef VISIT_GL_CALL
 
 extern "C" THUNK_EXPORT size_t
 MojoSetGLES2ImplThunks(const MojoGLES2ImplThunks* gles2_impl_thunks) {
   if (gles2_impl_thunks->size >= sizeof(g_impl_thunks))
     g_impl_thunks = *gles2_impl_thunks;
   return sizeof(g_impl_thunks);
 }
 
 }  // extern "C"