Revert "third_party/protobuf: Update to HEAD (83d681ee2c)"

third_party/protobuf/src/google/protobuf/timestamp.proto

Index: third_party/protobuf/src/google/protobuf/timestamp.proto
diff --git a/third_party/protobuf/src/google/protobuf/timestamp.proto b/third_party/protobuf/src/google/protobuf/timestamp.proto
index 67e2eba4f8536174f9bb95a327eea45ed25027fe..7992a85886fb0cf91fefabdd9bfa9acb07bd09bb 100644
--- a/third_party/protobuf/src/google/protobuf/timestamp.proto
+++ b/third_party/protobuf/src/google/protobuf/timestamp.proto
@@ -38,6 +38,7 @@ option go_package = "github.com/golang/protobuf/ptypes/timestamp";
 option java_package = "com.google.protobuf";
 option java_outer_classname = "TimestampProto";
 option java_multiple_files = true;
+option java_generate_equals_and_hash = true;
 option objc_class_prefix = "GPB";
 
 // A Timestamp represents a point in time independent of any time zone
@@ -89,14 +90,16 @@ option objc_class_prefix = "GPB";
 //
 // Example 5: Compute Timestamp from current time in Python.
 //
-//     timestamp = Timestamp()
-//     timestamp.GetCurrentTime()
+//     now = time.time()
+//     seconds = int(now)
+//     nanos = int((now - seconds) * 10**9)
+//     timestamp = Timestamp(seconds=seconds, nanos=nanos)
 //
 //
 message Timestamp {
 
   // Represents seconds of UTC time since Unix epoch
-  // 1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to
+  // 1970-01-01T00:00:00Z. Must be from from 0001-01-01T00:00:00Z to
   // 9999-12-31T23:59:59Z inclusive.
   int64 seconds = 1;