Update from https://crrev.com/327068

base/win/event_trace_consumer.h

 // Copyright (c) 2012 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.
 //
 // Declaration of a Windows event trace consumer base class.
 #ifndef BASE_WIN_EVENT_TRACE_CONSUMER_H_
 #define BASE_WIN_EVENT_TRACE_CONSUMER_H_
 
 #include <windows.h>
 #include <wmistr.h>
@@ skipping 101 matching lines @@
   if (reinterpret_cast<TRACEHANDLE>(INVALID_HANDLE_VALUE) == trace_handle)
     return HRESULT_FROM_WIN32(::GetLastError());
 
   trace_handles_.push_back(trace_handle);
   return S_OK;
 }
 
 template <class ImplClass> inline
 HRESULT EtwTraceConsumerBase<ImplClass>::Consume() {
   ULONG err = ::ProcessTrace(&trace_handles_[0],
-                             trace_handles_.size(),
+                             static_cast<ULONG>(trace_handles_.size()),
                              NULL,
                              NULL);
   return HRESULT_FROM_WIN32(err);
 }
 
 template <class ImplClass> inline
 HRESULT EtwTraceConsumerBase<ImplClass>::Close() {
   HRESULT hr = S_OK;
   for (size_t i = 0; i < trace_handles_.size(); ++i) {
     if (NULL != trace_handles_[i]) {
       ULONG ret = ::CloseTrace(trace_handles_[i]);
       trace_handles_[i] = NULL;
 
       if (FAILED(HRESULT_FROM_WIN32(ret)))
         hr = HRESULT_FROM_WIN32(ret);
     }
   }
   trace_handles_.clear();
 
   return hr;
 }
 
 }  // namespace win
 }  // namespace base
 
 #endif  // BASE_WIN_EVENT_TRACE_CONSUMER_H_