This fixes a number of things that are warnings in the Mac compiler....

statsreport/uploader_aggregation-win32.cc

 /*
  * Copyright 2009, Google Inc.
  * 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.
@@ skipping 53 matching lines @@
                           const char* user_agent,
                           DWORD interval,
                           StatsUploader* stats_uploader) {
   PersistentMetricsIteratorWin32 it(PRODUCT_NAME_STRING_WIDE), end;
   Formatter formatter(CStringA(PRODUCT_NAME_STRING), interval);
 
   for (; it != end; ++it)
     formatter.AddMetric(*it);
   DLOG(INFO) << "formatter.output() = " << formatter.output();
   return stats_uploader->UploadMetrics(extra_url_data, user_agent,
-                                       formatter.output());
+                                       formatter.output().c_str());
 }
 
 void ResetPersistentMetrics(CRegKey *key) {
   key->DeleteValue(kLastTransmissionTimeValueName);
   key->DeleteSubKey(kCountsKeyName);
   key->DeleteSubKey(kTimingsKeyName);
   key->DeleteSubKey(kIntegersKeyName);
   key->DeleteSubKey(kBooleansKeyName);
 }
 
@@ skipping 96 matching lines @@
 }
 
 // Used primarily for testing. Default functionality.
 bool StatsUploader::UploadMetrics(const char* extra_url_data,
                                   const char* user_agent,
                                   const char *content) {
   return stats_report::UploadMetrics(extra_url_data, user_agent, content);
 }
 
 }  // namespace stats_report