Correct data size argument type in resource loading path to unsigned

Source/core/xml/XMLHttpRequest.h

Index: Source/core/xml/XMLHttpRequest.h
diff --git a/Source/core/xml/XMLHttpRequest.h b/Source/core/xml/XMLHttpRequest.h
index 49828f24c0c59d1ded67777b763a370577e5f9fe..77ba4807616b2c942f45b30e6d343396ee47ee63 100644
--- a/Source/core/xml/XMLHttpRequest.h
+++ b/Source/core/xml/XMLHttpRequest.h
@@ -160,7 +160,7 @@ private:
 
     virtual void didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent) OVERRIDE;
     virtual void didReceiveResponse(unsigned long identifier, const ResourceResponse&) OVERRIDE;
-    virtual void didReceiveData(const char* data, int dataLength) OVERRIDE;
+    virtual void didReceiveData(const char* data, unsigned dataLength) OVERRIDE;
     // When responseType is set to "blob", didDownloadData() is called instead
     // of didReceiveData().
     virtual void didDownloadData(int dataLength) OVERRIDE;
@@ -191,7 +191,7 @@ private:
     PassOwnPtr<TextResourceDecoder> createDecoder() const;
 
     void initResponseDocument();
-    void parseDocumentChunk(const char* data, int dataLength);
+    void parseDocumentChunk(const char* data, unsigned dataLength);
 
     bool areMethodAndURLValidForSend();