Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/csharp/src/Google.Protobuf/WellKnownTypes/TimestampPartial.cs

Index: third_party/protobuf/csharp/src/Google.Protobuf/WellKnownTypes/TimestampPartial.cs
diff --git a/third_party/protobuf/csharp/src/Google.Protobuf/WellKnownTypes/TimestampPartial.cs b/third_party/protobuf/csharp/src/Google.Protobuf/WellKnownTypes/TimestampPartial.cs
deleted file mode 100644
index 6858435820dc7d9930596f34b1ac5ffc76d9a8ae..0000000000000000000000000000000000000000
--- a/third_party/protobuf/csharp/src/Google.Protobuf/WellKnownTypes/TimestampPartial.cs
+++ /dev/null
@@ -1,167 +0,0 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2015 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System;
-
-namespace Google.Protobuf.WellKnownTypes
-{
-    public partial class Timestamp
-    {
-        private static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
-        private static readonly long BclSecondsAtUnixEpoch = UnixEpoch.Ticks / TimeSpan.TicksPerSecond;
-
-        /// <summary>
-        /// Returns the difference between one <see cref="Timestamp"/> and another, as a <see cref="Duration"/>.
-        /// </summary>
-        /// <param name="lhs">The timestamp to subtract from. Must not be null.</param>
-        /// <param name="rhs">The timestamp to subtract. Must not be null.</param>
-        /// <returns>The difference between the two specified timestamps.</returns>
-        public static Duration operator -(Timestamp lhs, Timestamp rhs)
-        {
-            Preconditions.CheckNotNull(lhs, "lhs");
-            Preconditions.CheckNotNull(rhs, "rhs");
-            checked
-            {
-                return Duration.Normalize(lhs.Seconds - rhs.Seconds, lhs.Nanos - rhs.Nanos);
-            }
-        }
-
-        /// <summary>
-        /// Adds a <see cref="Duration"/> to a <see cref="Timestamp"/>, to obtain another <c>Timestamp</c>.
-        /// </summary>
-        /// <param name="lhs">The timestamp to add the duration to. Must not be null.</param>
-        /// <param name="rhs">The duration to add. Must not be null.</param>
-        /// <returns>The result of adding the duration to the timestamp.</returns>
-        public static Timestamp operator +(Timestamp lhs, Duration rhs)
-        {
-            Preconditions.CheckNotNull(lhs, "lhs");
-            Preconditions.CheckNotNull(rhs, "rhs");
-            checked
-            {
-                return Normalize(lhs.Seconds + rhs.Seconds, lhs.Nanos + rhs.Nanos);
-            }
-        }
-
-        /// <summary>
-        /// Subtracts a <see cref="Duration"/> from a <see cref="Timestamp"/>, to obtain another <c>Timestamp</c>.
-        /// </summary>
-        /// <param name="lhs">The timestamp to subtract the duration from. Must not be null.</param>
-        /// <param name="rhs">The duration to subtract.</param>
-        /// <returns>The result of subtracting the duration from the timestamp.</returns>
-        public static Timestamp operator -(Timestamp lhs, Duration rhs)
-        {
-            Preconditions.CheckNotNull(lhs, "lhs");
-            Preconditions.CheckNotNull(rhs, "rhs");
-            checked
-            {
-                return Normalize(lhs.Seconds - rhs.Seconds, lhs.Nanos - rhs.Nanos);
-            }
-        }
-
-        /// <summary>
-        /// Converts this timestamp into a <see cref="DateTime"/>.
-        /// </summary>
-        /// <remarks>
-        /// The resulting <c>DateTime</c> will always have a <c>Kind</c> of <c>Utc</c>.
-        /// If the timestamp is not a precise number of ticks, it will be truncated towards the start
-        /// of time. For example, a timestamp with a <see cref="Nanos"/> value of 99 will result in a
-        /// <see cref="DateTime"/> value precisely on a second.
-        /// </remarks>
-        /// <returns>This timestamp as a <c>DateTime</c>.</returns>
-        public DateTime ToDateTime()
-        {
-            return UnixEpoch.AddSeconds(Seconds).AddTicks(Nanos / Duration.NanosecondsPerTick);
-        }
-
-        /// <summary>
-        /// Converts this timestamp into a <see cref="DateTimeOffset"/>.
-        /// </summary>
-        /// <remarks>
-        /// The resulting <c>DateTimeOffset</c> will always have an <c>Offset</c> of zero.
-        /// If the timestamp is not a precise number of ticks, it will be truncated towards the start
-        /// of time. For example, a timestamp with a <see cref="Nanos"/> value of 99 will result in a
-        /// <see cref="DateTimeOffset"/> value precisely on a second.
-        /// </remarks>
-        /// <returns>This timestamp as a <c>DateTimeOffset</c>.</returns>
-        public DateTimeOffset ToDateTimeOffset()
-        {
-            return new DateTimeOffset(ToDateTime(), TimeSpan.Zero);
-        }
-
-        /// <summary>
-        /// Converts the specified <see cref="DateTime"/> to a <see cref="Timestamp"/>.
-        /// </summary>
-        /// <param name="dateTime"></param>
-        /// <exception cref="ArgumentException">The <c>Kind</c> of <paramref name="dateTime"/> is not <c>DateTimeKind.Utc</c>.</exception>
-        /// <returns>The converted timestamp.</returns>
-        public static Timestamp FromDateTime(DateTime dateTime)
-        {
-            if (dateTime.Kind != DateTimeKind.Utc)
-            {
-                throw new ArgumentException("Conversion from DateTime to Timestamp requires the DateTime kind to be Utc", "dateTime");
-            }
-            // Do the arithmetic using DateTime.Ticks, which is always non-negative, making things simpler.
-            long secondsSinceBclEpoch = dateTime.Ticks / TimeSpan.TicksPerSecond;
-            int nanoseconds = (int)  (dateTime.Ticks % TimeSpan.TicksPerSecond) * Duration.NanosecondsPerTick;
-            return new Timestamp { Seconds = secondsSinceBclEpoch - BclSecondsAtUnixEpoch, Nanos = nanoseconds };
-        }
-
-        /// <summary>
-        /// Converts the given <see cref="DateTimeOffset"/> to a <see cref="Timestamp"/>
-        /// </summary>
-        /// <remarks>The offset is taken into consideration when converting the value (so the same instant in time
-        /// is represented) but is not a separate part of the resulting value. In other words, there is no
-        /// roundtrip operation to retrieve the original <c>DateTimeOffset</c>.</remarks>
-        /// <param name="dateTimeOffset">The date and time (with UTC offset) to convert to a timestamp.</param>
-        /// <returns>The converted timestamp.</returns>
-        public static Timestamp FromDateTimeOffset(DateTimeOffset dateTimeOffset)
-        {
-            // We don't need to worry about this having negative ticks: DateTimeOffset is constrained to handle
-            // values whose *UTC* value is in the range of DateTime.
-            return FromDateTime(dateTimeOffset.UtcDateTime);
-        }
-
-        internal static Timestamp Normalize(long seconds, int nanoseconds)
-        {
-            int extraSeconds = nanoseconds / Duration.NanosecondsPerSecond;
-            seconds += extraSeconds;
-            nanoseconds -= extraSeconds * Duration.NanosecondsPerSecond;
-
-            if (nanoseconds < 0)
-            {
-                nanoseconds += Duration.NanosecondsPerSecond;
-                seconds--;
-            }
-            return new Timestamp { Seconds = seconds, Nanos = nanoseconds };
-        }
-    }
-}