Fix errors caused by unsafe conversions to/from size_t

third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013, Intel Corporation
  *
  * 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 629 matching lines @@
 }
 
 void DocumentThreadableLoader::setSerializedCachedMetadata(Resource*, const char* data, size_t size)
 {
     if (!m_actualRequest.isNull())
         return;
     m_client->didReceiveCachedMetadata(data, size);
     // |this| may be dead here.
 }
 
-void DocumentThreadableLoader::dataReceived(Resource* resource, const char* data, unsigned dataLength)
+void DocumentThreadableLoader::dataReceived(Resource* resource, const char* data, size_t dataLength)
 {
     ASSERT_UNUSED(resource, resource == this->resource());
     ASSERT(m_async);
 
     if (m_isUsingDataConsumerHandle)
         return;
 
-    handleReceivedData(data, dataLength);
+    // TODO(junov): Fix the ThreadableLoader ecosystem to use size_t.
+    // Until then, we use safeCast to trap potential overflows.
+    handleReceivedData(data, safeCast<unsigned>(dataLength));
     // |this| may be dead here.
 }
 
-void DocumentThreadableLoader::handleReceivedData(const char* data, unsigned dataLength)
+void DocumentThreadableLoader::handleReceivedData(const char* data, size_t dataLength)
 {
     ASSERT(m_client);
 
     // Preflight data should be invisible to clients.
     if (!m_actualRequest.isNull())
         return;
 
     ASSERT(m_fallbackRequestForServiceWorker.isNull());
 
     m_client->didReceiveData(data, dataLength);
@@ skipping 217 matching lines @@
     return m_securityOrigin ? m_securityOrigin.get() : document().securityOrigin();
 }
 
 Document& DocumentThreadableLoader::document() const
 {
     ASSERT(m_document);
     return *m_document;
 }
 
 } // namespace blink