Warn on missing OVERRIDE/virtual everywhere, not just in header files.

net/quic/quic_framer_test.cc

Index: net/quic/quic_framer_test.cc
diff --git a/net/quic/quic_framer_test.cc b/net/quic/quic_framer_test.cc
index 74f2be758eb06acb49c6348eef4a3a439290460f..ebb8cd057386aac2427ea3ecad64886cb13f943a 100644
--- a/net/quic/quic_framer_test.cc
+++ b/net/quic/quic_framer_test.cc
@@ -78,13 +78,13 @@ class TestEncrypter : public QuicEncrypter {
   virtual bool Encrypt(StringPiece nonce,
                        StringPiece associated_data,
                        StringPiece plaintext,
-                       unsigned char* output) {
+                       unsigned char* output) OVERRIDE {
     CHECK(false) << "Not implemented";
     return false;
   }
   virtual QuicData* EncryptPacket(QuicPacketSequenceNumber sequence_number,
                                   StringPiece associated_data,
-                                  StringPiece plaintext) {
+                                  StringPiece plaintext) OVERRIDE {
     sequence_number_ = sequence_number;
     associated_data_ = associated_data.as_string();
     plaintext_ = plaintext.as_string();
@@ -126,13 +126,13 @@ class TestDecrypter : public QuicDecrypter {
                        StringPiece associated_data,
                        StringPiece ciphertext,
                        unsigned char* output,
-                       size_t* output_length) {
+                       size_t* output_length) OVERRIDE {
     CHECK(false) << "Not implemented";
     return false;
   }
   virtual QuicData* DecryptPacket(QuicPacketSequenceNumber sequence_number,
                                   StringPiece associated_data,
-                                  StringPiece ciphertext) {
+                                  StringPiece ciphertext) OVERRIDE {
     sequence_number_ = sequence_number;
     associated_data_ = associated_data.as_string();
     ciphertext_ = ciphertext.as_string();