Correct data size argument type in resource loading path to unsigned

Source/core/inspector/InspectorResourceAgent.cpp

Index: Source/core/inspector/InspectorResourceAgent.cpp
diff --git a/Source/core/inspector/InspectorResourceAgent.cpp b/Source/core/inspector/InspectorResourceAgent.cpp
index faf6365d908477e9d52761212891ca0b94b3a5d0..f881e4678ea0b623a974c3e025a4053e47570a19 100644
--- a/Source/core/inspector/InspectorResourceAgent.cpp
+++ b/Source/core/inspector/InspectorResourceAgent.cpp
@@ -117,14 +117,11 @@ public:
         m_responseHeaders = response.httpHeaderFields();
     }
 
-    virtual void didReceiveData(const char* data, int dataLength) OVERRIDE
+    virtual void didReceiveData(const char* data, unsigned dataLength) OVERRIDE
     {
         if (!dataLength)
             return;
 
-        if (dataLength == -1)
-            dataLength = strlen(data);
-
         m_responseText = m_responseText.concatenateWith(m_decoder->decode(data, dataLength));
     }