Another attempt to fix a Chrome crash.

chrome/browser/net/network_stats.h

Index: chrome/browser/net/network_stats.h
diff --git a/chrome/browser/net/network_stats.h b/chrome/browser/net/network_stats.h
index 59bf0b0e55ef2c018b595338ff4324aa0ed5f281..65c8aae55cfaea64302d6ad662c94224cf045a44 100644
--- a/chrome/browser/net/network_stats.h
+++ b/chrome/browser/net/network_stats.h
@@ -142,8 +142,9 @@ class NetworkStats {
   void OnWriteComplete(int result);
 
   // Read data from server until an error or IO blocking occurs or reading is
-  // complete.
-  void ReadData();
+  // complete. Return the result value from socket reading and 0 if |socket_|
+  // is Null.
+  int ReadData();
 
   // Send data contained in |str| to server.
   // Return a negative value if IO blocking occurs or there is an error.