Fix warnings on Win64.

src/log.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 897 matching lines @@
 }
 
 
 void Logger::HeapSampleJSRetainersEvent(
     const char* constructor, const char* event) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (!Log::IsEnabled() || !FLAG_log_gc) return;
   // Event starts with comma, so we don't have it in the format string.
   static const char* event_text = "heap-js-ret-item,%s";
   // We take placeholder strings into account, but it's OK to be conservative.
-  static const int event_text_len = strlen(event_text);
-  const int cons_len = strlen(constructor), event_len = strlen(event);
+  static const int event_text_len = StrLength(event_text);
+  const int cons_len = StrLength(constructor);
+  const int event_len = StrLength(event);
   int pos = 0;
   // Retainer lists can be long. We may need to split them into multiple events.
   do {
     LogMessageBuilder msg;
     msg.Append(event_text, constructor);
     int to_write = event_len - pos;
     if (to_write > Log::kMessageBufferSize - (cons_len + event_text_len)) {
       int cut_pos = pos + Log::kMessageBufferSize - (cons_len + event_text_len);
       ASSERT(cut_pos < event_len);
       while (cut_pos > pos && event[cut_pos] != ',') --cut_pos;
@@ skipping 382 matching lines @@
   // Otherwise, if the sliding state window computation has not been
   // started we do it now.
   if (sliding_state_window_ == NULL) {
     sliding_state_window_ = new SlidingStateWindow();
   }
 #endif
 }
 
 
 } }  // namespace v8::internal