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

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

Index: third_party/protobuf/csharp/src/Google.Protobuf/WellKnownTypes/TimeExtensions.cs
diff --git a/third_party/protobuf/csharp/src/Google.Protobuf/WellKnownTypes/TimeExtensions.cs b/third_party/protobuf/csharp/src/Google.Protobuf/WellKnownTypes/TimeExtensions.cs
deleted file mode 100644
index dd485d324aa129f803d7c9e44e97c5acded6641c..0000000000000000000000000000000000000000
--- a/third_party/protobuf/csharp/src/Google.Protobuf/WellKnownTypes/TimeExtensions.cs
+++ /dev/null
@@ -1,80 +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;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Google.Protobuf.WellKnownTypes
-{
-    /// <summary>
-    /// Extension methods on BCL time-related types, converting to protobuf types.
-    /// </summary>
-    public static class TimeExtensions
-    {
-        /// <summary>
-        /// Converts the given <see cref="DateTime"/> to a <see cref="Timestamp"/>.
-        /// </summary>
-        /// <param name="dateTime">The date and time to convert to a timestamp.</param>
-        /// <exception cref="ArgumentException">The <paramref name="dateTime"/> value has a <see cref="DateTime.Kind"/>other than <c>Utc</c>.</exception>
-        /// <returns>The converted timestamp.</returns>
-        public static Timestamp ToTimestamp(this DateTime dateTime)
-        {
-            return Timestamp.FromDateTime(dateTime);
-        }
-
-        /// <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 ToTimestamp(this DateTimeOffset dateTimeOffset)
-        {
-            return Timestamp.FromDateTimeOffset(dateTimeOffset);
-        }
-
-        /// <summary>
-        /// Converts the given <see cref="TimeSpan"/> to a <see cref="Duration"/>.
-        /// </summary>
-        /// <param name="timeSpan">The time span to convert.</param>
-        /// <returns>The converted duration.</returns>
-        public static Duration ToDuration(this TimeSpan timeSpan)
-        {
-            return Duration.FromTimeSpan(timeSpan);
-        }
-    }
-}