Rename QUIC connection timeout error codes to be more descriptive.

net/quic/quic_protocol.h

Index: net/quic/quic_protocol.h
diff --git a/net/quic/quic_protocol.h b/net/quic/quic_protocol.h
index b2dbd2cc2070674c76de3ec03f6f7017966c0064..744a5ee0a79c1edceae51138df48d3845d9aad15 100644
--- a/net/quic/quic_protocol.h
+++ b/net/quic/quic_protocol.h
@@ -492,7 +492,6 @@ AdjustErrorForVersion(QuicRstStreamErrorCode error_code, QuicVersion version);
 // These values must remain stable as they are uploaded to UMA histograms.
 // To add a new error code, use the current value of QUIC_LAST_ERROR and
 // increment QUIC_LAST_ERROR.
-// last value = 80
 enum QuicErrorCode {
   QUIC_NO_ERROR = 0,
 
@@ -562,10 +561,10 @@ enum QuicErrorCode {
   QUIC_INVALID_NEGOTIATED_VALUE = 23,
   // There was an error decompressing data.
   QUIC_DECOMPRESSION_FAILURE = 24,
-  // We hit our prenegotiated (or default) timeout
-  QUIC_CONNECTION_TIMED_OUT = 25,
-  // We hit our overall connection timeout
-  QUIC_CONNECTION_OVERALL_TIMED_OUT = 67,
+  // The connection timed out due to no network activity.
+  QUIC_NETWORK_IDLE_TIMEOUT = 25,
+  // The connection timed out waiting for the handshake to complete.
+  QUIC_HANDSHAKE_TIMEOUT = 67,
   // There was an error encountered migrating addresses
   QUIC_ERROR_MIGRATING_ADDRESS = 26,
   // There was an error while writing to the socket.