Fix errors caused by unsafe conversions to/from size_t

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

 /*
  * Copyright (c) 2013, 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 52 matching lines @@
     DummyClient() : m_called(false) {}
     ~DummyClient() override {}
 
     // ResourceClient implementation.
     void notifyFinished(Resource* resource) override
     {
         m_called = true;
     }
     String debugName() const override { return "DummyClient"; }
 
-    void dataReceived(Resource*, const char* data, unsigned length) override
+    void dataReceived(Resource*, const char* data, size_t length) override
     {
         m_data.append(data, length);
     }
 
     bool called() { return m_called; }
     const Vector<char>& data() { return m_data; }
 private:
     bool m_called;
     Vector<char> m_data;
 };
@@ skipping 142 matching lines @@
 
     OwnPtr<DummyClient> dummyClient = adoptPtr(new DummyClient());
     OwnPtr<RemovingClient> removingClient = adoptPtr(new RemovingClient(dummyClient.get()));
     raw->addClient(dummyClient.get());
     raw->addClient(removingClient.get());
     testing::runPendingTasks();
     EXPECT_FALSE(raw->hasClients());
 }
 
 } // namespace blink