Fix WebSocketServer extension parser.

net/websockets/websocket_deflate_parameters.h

Index: net/websockets/websocket_deflate_parameters.h
diff --git a/net/websockets/websocket_deflate_parameters.h b/net/websockets/websocket_deflate_parameters.h
index d0c73bfff5a14157356c2a9ae8c42ca9f108abad..a377e523a91d672a31c5c2aac6072f5ff07fe3cb 100644
--- a/net/websockets/websocket_deflate_parameters.h
+++ b/net/websockets/websocket_deflate_parameters.h
@@ -95,6 +95,13 @@ class NET_EXPORT_PRIVATE WebSocketDeflateParameters {
     client_max_window_bits_ = WindowBits(bits, true, true);
   }
 
+  int PermissiveServerMaxWindowBits() const {
+    return server_max_window_bits_.PermissiveBits();
+  }
+  int PermissiveClientMaxWindowBits() const {
+    return client_max_window_bits_.PermissiveBits();
+  }
+
   // Return true if |bits| is valid as a max_window_bits value.
   static bool IsValidWindowBits(int bits) { return 8 <= bits && bits <= 15; }
 
@@ -104,6 +111,10 @@ class NET_EXPORT_PRIVATE WebSocketDeflateParameters {
     WindowBits(int16_t bits, bool is_specified, bool has_value)
         : bits(bits), is_specified(is_specified), has_value(has_value) {}
 
+    int PermissiveBits() const {
+      return (is_specified && has_value) ? bits : 15;
+    }
+
     int16_t bits;
     // True when "window bits" parameter appears in the parameters.
     bool is_specified;