mojo: Fix warning (treated as error) on Windows perf bots

mojo/public/cpp/bindings/lib/validation_context.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/cpp/bindings/lib/validation_context.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
 #include "mojo/public/cpp/bindings/lib/serialization_util.h"
 #include "mojo/public/cpp/bindings/message.h"
 #include "mojo/public/cpp/system/handle.h"
 
 namespace mojo {
 namespace internal {
 
 ValidationContext::ValidationContext(const void* data,
-                                     uint32_t data_num_bytes,
+                                     size_t data_num_bytes,
                                      size_t num_handles,
                                      Message* message,
                                      const base::StringPiece& description)
     : message_(message),
       description_(description),
       data_begin_(reinterpret_cast<uintptr_t>(data)),
       data_end_(data_begin_ + data_num_bytes),
       handle_begin_(0),
       handle_end_(static_cast<uint32_t>(num_handles)) {
   if (data_end_ < data_begin_) {
@@ skipping 47 matching lines @@
   return InternalIsValidRange(begin, end);
 }
 
 bool ValidationContext::InternalIsValidRange(uintptr_t begin,
                                              uintptr_t end) const {
   return end > begin && begin >= data_begin_ && end <= data_end_;
 }
 
 }  // namespace internal
 }  // namespace mojo