Update //third_party/protobuf to version 3.

third_party/protobuf/objectivec/google/protobuf/Duration.pbobjc.h

Index: third_party/protobuf/objectivec/google/protobuf/Duration.pbobjc.h
diff --git a/third_party/protobuf/objectivec/google/protobuf/Duration.pbobjc.h b/third_party/protobuf/objectivec/google/protobuf/Duration.pbobjc.h
new file mode 100644
index 0000000000000000000000000000000000000000..b592640b0a67879569e1eddb4b9365efaa92f21f
--- /dev/null
+++ b/third_party/protobuf/objectivec/google/protobuf/Duration.pbobjc.h
@@ -0,0 +1,94 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/protobuf/duration.proto
+
+#import "GPBProtocolBuffers.h"
+
+#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
+#error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
+#endif
+
+// @@protoc_insertion_point(imports)
+
+CF_EXTERN_C_BEGIN
+
+NS_ASSUME_NONNULL_BEGIN
+
+#pragma mark - GPBDurationRoot
+
+@interface GPBDurationRoot : GPBRootObject
+
+// The base class provides:
+//   + (GPBExtensionRegistry *)extensionRegistry;
+// which is an GPBExtensionRegistry that includes all the extensions defined by
+// this file and all files that it depends on.
+
+@end
+
+#pragma mark - GPBDuration
+
+typedef GPB_ENUM(GPBDuration_FieldNumber) {
+  GPBDuration_FieldNumber_Seconds = 1,
+  GPBDuration_FieldNumber_Nanos = 2,
+};
+
+// A Duration represents a signed, fixed-length span of time represented
+// as a count of seconds and fractions of seconds at nanosecond
+// resolution. It is independent of any calendar and concepts like "day"
+// or "month". It is related to Timestamp in that the difference between
+// two Timestamp values is a Duration and it can be added or subtracted
+// from a Timestamp. Range is approximately +-10,000 years.
+//
+// Example 1: Compute Duration from two Timestamps in pseudo code.
+//
+//     Timestamp start = ...;
+//     Timestamp end = ...;
+//     Duration duration = ...;
+//
+//     duration.seconds = end.seconds - start.seconds;
+//     duration.nanos = end.nanos - start.nanos;
+//
+//     if (duration.seconds < 0 && duration.nanos > 0) {
+//       duration.seconds += 1;
+//       duration.nanos -= 1000000000;
+//     } else if (durations.seconds > 0 && duration.nanos < 0) {
+//       duration.seconds -= 1;
+//       duration.nanos += 1000000000;
+//     }
+//
+// Example 2: Compute Timestamp from Timestamp + Duration in pseudo code.
+//
+//     Timestamp start = ...;
+//     Duration duration = ...;
+//     Timestamp end = ...;
+//
+//     end.seconds = start.seconds + duration.seconds;
+//     end.nanos = start.nanos + duration.nanos;
+//
+//     if (end.nanos < 0) {
+//       end.seconds -= 1;
+//       end.nanos += 1000000000;
+//     } else if (end.nanos >= 1000000000) {
+//       end.seconds += 1;
+//       end.nanos -= 1000000000;
+//     }
+@interface GPBDuration : GPBMessage
+
+// Signed seconds of the span of time. Must be from -315,576,000,000
+// to +315,576,000,000 inclusive.
+@property(nonatomic, readwrite) int64_t seconds;
+
+// Signed fractions of a second at nanosecond resolution of the span
+// of time. Durations less than one second are represented with a 0
+// `seconds` field and a positive or negative `nanos` field. For durations
+// of one second or more, a non-zero value for the `nanos` field must be
+// of the same sign as the `seconds` field. Must be from -999,999,999
+// to +999,999,999 inclusive.
+@property(nonatomic, readwrite) int32_t nanos;
+
+@end
+
+NS_ASSUME_NONNULL_END
+
+CF_EXTERN_C_END
+
+// @@protoc_insertion_point(global_scope)