Simplify QUIC's encryption path now that FEC is gone. Protected by FLAG_quic_inplace_encryption.

net/quic/quic_framer.cc

Index: net/quic/quic_framer.cc
diff --git a/net/quic/quic_framer.cc b/net/quic/quic_framer.cc
index 3100a85fe56bc31f4df455eba9c2b46df0baa7ca..042acdc8a82a3ae6adc53cc06d17c1e829c3f6f8 100644
--- a/net/quic/quic_framer.cc
+++ b/net/quic/quic_framer.cc
@@ -1632,6 +1632,27 @@ void QuicFramer::SetEncrypter(EncryptionLevel level, QuicEncrypter* encrypter) {
   encrypter_[level].reset(encrypter);
 }
 
+size_t QuicFramer::EncryptInPlace(EncryptionLevel level,
+                                  QuicPathId path_id,
+                                  QuicPacketNumber packet_number,
+                                  size_t ad_len,
+                                  size_t total_len,
+                                  size_t buffer_len,
+                                  char* buffer) {
+  size_t output_length = 0;
+  if (!encrypter_[level]->EncryptPacket(
+          path_id, packet_number,
+          StringPiece(buffer, ad_len),                       // Associated data
+          StringPiece(buffer + ad_len, total_len - ad_len),  // Plaintext
+          buffer + ad_len,  // Destination buffer
+          &output_length, buffer_len - ad_len)) {
+    RaiseError(QUIC_ENCRYPTION_FAILURE);
+    return 0;
+  }
+
+  return ad_len + output_length;
+}
+
 size_t QuicFramer::EncryptPayload(EncryptionLevel level,
                                   QuicPathId path_id,
                                   QuicPacketNumber packet_number,