Drop "Interface" from name of QUIC debug interfaces that should not be

net/quic/quic_connection_test.cc

Index: net/quic/quic_connection_test.cc
diff --git a/net/quic/quic_connection_test.cc b/net/quic/quic_connection_test.cc
index 54817151c18aa6c956117ff61de8ceae9d406174..6707c4ad1d024ef74b533eba827f41c3bb0384b6 100644
--- a/net/quic/quic_connection_test.cc
+++ b/net/quic/quic_connection_test.cc
@@ -556,7 +556,7 @@ class TestConnection : public QuicConnection {
 
 // Used for testing packets revived from FEC packets.
 class FecQuicConnectionDebugVisitor
-    : public QuicConnectionDebugVisitorInterface {
+    : public QuicConnectionDebugVisitor {
  public:
   virtual void OnRevivedPacket(const QuicPacketHeader& header,
                                StringPiece data) OVERRIDE {
@@ -3869,7 +3869,7 @@ TEST_P(QuicConnectionTest, AckNotifierCallbackAfterFECRecovery) {
 }
 
 class MockQuicConnectionDebugVisitor
-    : public QuicConnectionDebugVisitorInterface {
+    : public QuicConnectionDebugVisitor {
  public:
   MOCK_METHOD1(OnFrameAddedToPacket,
                void(const QuicFrame&));