Add a UniqueVector class to GN

base/debug/stack_trace_win.cc

 // 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.
 
 #include "base/debug/stack_trace.h"
 
 #include <windows.h>
 #include <dbghelp.h>
 
 #include <iostream>
@@ skipping 245 matching lines @@
 void StackTrace::Print() const {
   OutputToStream(&std::cerr);
 }
 
 void StackTrace::OutputToStream(std::ostream* os) const {
   SymbolContext* context = SymbolContext::GetInstance();
   DWORD error = context->init_error();
   if (error != ERROR_SUCCESS) {
     (*os) << "Error initializing symbols (" << error
           << ").  Dumping unresolved backtrace:\n";
-    for (int i = 0; (i < count_) && os->good(); ++i) {
+    for (size_t i = 0; (i < count_) && os->good(); ++i) {
       (*os) << "\t" << trace_[i] << "\n";
     }
   } else {
     (*os) << "Backtrace:\n";
     context->OutputTraceToStream(trace_, count_, os);
   }
 }
 
 }  // namespace debug
 }  // namespace base