Fix errors caused by unsafe conversions to/from size_t

third_party/WebKit/Source/core/fetch/TextResource.cpp

 // Copyright 2014 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 "core/fetch/TextResource.h"
 
 #include "core/html/parser/TextResourceDecoder.h"
 #include "platform/SharedBuffer.h"
 #include "wtf/text/StringBuilder.h"
 
@@ skipping 18 matching lines @@
 {
     return m_decoder->encoding().name();
 }
 
 String TextResource::decodedText() const
 {
     ASSERT(m_data);
 
     StringBuilder builder;
     const char* data;
-    unsigned position = 0;
-    while (unsigned length = m_data->getSomeData(data, position)) {
+    size_t position = 0;
+    while (size_t length = m_data->getSomeData(data, position)) {
         builder.append(m_decoder->decode(data, length));
         position += length;
     }
     builder.append(m_decoder->flush());
     return builder.toString();
 }
 
 } // namespace blink