Switch to standard integer types in mojo/.

mojo/public/cpp/bindings/lib/fixed_buffer.h

 // 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.
 
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_FIXED_BUFFER_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_FIXED_BUFFER_H_
 
+#include <stddef.h>
+
 #include "mojo/public/cpp/bindings/lib/buffer.h"
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
 namespace internal {
 
 // FixedBuffer provides a simple way to allocate objects within a fixed chunk
 // of memory. Objects are allocated by calling the |Allocate| method, which
 // extends the buffer accordingly. Objects allocated in this way are not freed
 // explicitly. Instead, they remain valid so long as the FixedBuffer remains
@@ skipping 53 matching lines @@
   void* Leak();
 
  private:
   MOJO_DISALLOW_COPY_AND_ASSIGN(FixedBufferForTesting);
 };
 
 }  // namespace internal
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_FIXED_BUFFER_H_