MD5Update function uses StringPiece instead of raw buffer.

chrome/browser/metrics/metrics_service.cc

 // Copyright (c) 2011 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.
 
 //------------------------------------------------------------------------------
 // Description of the life cycle of a instance of MetricsService.
 //
 //  OVERVIEW
 //
 // A MetricsService instance is typically created at application startup.  It
@@ skipping 1116 matching lines @@
   std::string encoded_log;
   std::string decoded_log;
   for (ListValue::const_iterator it = list.begin() + 1;
        it != list.end() - 1; ++it) {  // Last element is the checksum.
     valid = (*it)->GetAsString(&encoded_log);
     if (!valid) {
       local_list->clear();
       return MakeRecallStatusHistogram(LOG_STRING_CORRUPTION);
     }
 
-    base::MD5Update(&ctx, encoded_log.data(), encoded_log.length());
+    base::MD5Update(&ctx, encoded_log);
 
     if (!base::Base64Decode(encoded_log, &decoded_log)) {
       local_list->clear();
       return MakeRecallStatusHistogram(DECODE_FAIL);
     }
     local_list->push_back(decoded_log);
   }
 
   // Verify checksum.
   base::MD5Digest digest;
@@ skipping 45 matching lines @@
   std::string encoded_log;
   for (std::vector<std::string>::const_iterator it = local_list.begin() + start;
        it != local_list.end(); ++it) {
     // We encode the compressed log as Value::CreateStringValue() expects to
     // take a valid UTF8 string.
     if (!base::Base64Encode(*it, &encoded_log)) {
       MakeStoreStatusHistogram(ENCODE_FAIL);
       list->Clear();
       return;
     }
-    base::MD5Update(&ctx, encoded_log.data(), encoded_log.length());
+    base::MD5Update(&ctx, encoded_log);
     list->Append(Value::CreateStringValue(encoded_log));
   }
 
   // Append hash to the end of the list.
   base::MD5Digest digest;
   base::MD5Final(&digest, &ctx);
   list->Append(Value::CreateStringValue(base::MD5DigestToBase16(digest)));
   DCHECK(list->GetSize() >= 3);  // Minimum of 3 elements (size, data, hash).
   MakeStoreStatusHistogram(STORE_SUCCESS);
 }
@@ skipping 477 matching lines @@
     thread_id = base::PlatformThread::CurrentId();
   return base::PlatformThread::CurrentId() == thread_id;
 }
 
 #if defined(OS_CHROMEOS)
 void MetricsService::StartExternalMetrics() {
   external_metrics_ = new chromeos::ExternalMetrics;
   external_metrics_->Start();
 }
 #endif