Improve memory estimate of SpdySessionPool in net/ MemoryDumpProvider.

net/proxy/proxy_server.h

Index: net/proxy/proxy_server.h
diff --git a/net/proxy/proxy_server.h b/net/proxy/proxy_server.h
index 12ec217506e4f0f4feac89e089998c1acd7b0fc6..bc6316451abbf7a19353e04b7e85bd0908f8e873 100644
--- a/net/proxy/proxy_server.h
+++ b/net/proxy/proxy_server.h
@@ -155,6 +155,9 @@ class NET_EXPORT ProxyServer {
            std::tie(other.scheme_, other.host_port_pair_);
   }
 
+  // Returns the estimate of dynamically allocated memory in bytes.
+  size_t EstimateMemoryUsage() const;
+
  private:
   // Creates a ProxyServer given a scheme, and host/port string. If parsing the
   // host/port string fails, the returned instance will be invalid.