Fix errors caused by unsafe conversions to/from size_t

third_party/WebKit/Source/platform/mhtml/MHTMLArchive.cpp

 /*
  * Copyright (C) 2011 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 184 matching lines @@
             position += length;
         }
     } else {
         // FIXME: ideally we would encode the content as a stream without having to fetch it all.
         const char* data = resource.data->data();
         size_t dataLength = resource.data->size();
         Vector<char> encodedData;
         if (!strcmp(contentEncoding, quotedPrintable)) {
             quotedPrintableEncode(data, dataLength, encodedData);
             outputBuffer.append(encodedData.data(), encodedData.size());
-            outputBuffer.append("\r\n", 2);
+            outputBuffer.append("\r\n", 2u);
         } else {
             ASSERT(!strcmp(contentEncoding, base64));
             // We are not specifying insertLFs = true below as it would cut the lines with LFs and MHTML requires CRLFs.
             base64Encode(data, dataLength, encodedData);
             const size_t maximumLineLength = 76;
             size_t index = 0;
             size_t encodedDataLength = encodedData.size();
             do {
                 size_t lineLength = std::min(encodedDataLength - index, maximumLineLength);
                 outputBuffer.append(encodedData.data() + index, lineLength);
-                outputBuffer.append("\r\n", 2);
+                outputBuffer.append("\r\n", 2u);
                 index += maximumLineLength;
             } while (index < encodedDataLength);
         }
     }
 }
 
 void MHTMLArchive::generateMHTMLFooter(
     const String& boundary,
     SharedBuffer& outputBuffer)
 {
@@ skipping 37 matching lines @@
 }
 
 DEFINE_TRACE(MHTMLArchive)
 {
     visitor->trace(m_mainResource);
     visitor->trace(m_subresources);
     visitor->trace(m_subframeArchives);
 }
 
 }