Fix a 64-bit pointer truncation bug found by VC++ 2015

webrtc/base/trace_event.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 under third_party_mods/chromium or at:
 // http://src.chromium.org/svn/trunk/src/LICENSE
 
 #ifndef WEBRTC_BASE_TRACE_EVENT_H_
 #define WEBRTC_BASE_TRACE_EVENT_H_
 
 #include <string>
 
@@ skipping 683 matching lines @@
          : data_(static_cast<unsigned long long>(id)) {}
 
      unsigned long long data() const { return data_; }
 
     private:
      unsigned long long data_;
   };
 
   explicit TraceID(const void* id, unsigned char* flags)
       : data_(static_cast<unsigned long long>(
-              reinterpret_cast<unsigned long>(id))) {
+              reinterpret_cast<uintptr_t>(id))) {
     *flags |= TRACE_EVENT_FLAG_MANGLE_ID;
   }
   explicit TraceID(ForceMangle id, unsigned char* flags) : data_(id.data()) {
     *flags |= TRACE_EVENT_FLAG_MANGLE_ID;
   }
   explicit TraceID(unsigned long long id, unsigned char* flags)
       : data_(id) { (void)flags; }
   explicit TraceID(unsigned long id, unsigned char* flags)
       : data_(id) { (void)flags; }
   explicit TraceID(unsigned int id, unsigned char* flags)
@@ skipping 192 matching lines @@
     const char* name;
   };
   Data* p_data_;
   Data data_;
 };
 
 }  // namespace trace_event_internal
 }  // namespace webrtc
 
 #endif  // WEBRTC_BASE_TRACE_EVENT_H_