Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/objectivec/Tests/unittest_objc.proto

 // Protocol Buffers - Google's data interchange format
 // Copyright 2011 Google Inc.  All rights reserved.
 //
 // 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
@@ skipping 11 matching lines @@
 // 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.
 
 syntax = "proto2";
 
-import "google/protobuf/any.proto";
 import "google/protobuf/unittest.proto";
 
 package protobuf_unittest;
 
-// Used to check that Headerdocs and appledoc work correctly. If these comments
-// are not handled correctly, Xcode will fail to build the tests.
-message TestGeneratedComments {
-  // This is a string that could contain stuff like
-  // mime types as image/* or */plain. Maybe twitter usernames
-  // like @protobuf, @google or @something.
-  optional string string_field = 1;
-}
-
 // Using the messages in unittest.proto, setup for recursive cases for testing
 // extensions at various depths.
 extend TestAllExtensions {
   optional TestAllExtensions recursive_extension = 86;
 }
 
 // Recursive message to for testing autocreators at different depths.
 message TestRecursiveMessageWithRepeatedField {
   optional TestRecursiveMessageWithRepeatedField a = 1;
   repeated int32 i = 2;
@@ skipping 394 matching lines @@
   optional bool bool_field_24 = 24;
   optional bool bool_field_25 = 25;
   optional bool bool_field_26 = 26;
   optional bool bool_field_27 = 27;
   optional bool bool_field_28 = 28;
   optional bool bool_field_29 = 29;
   optional bool bool_field_30 = 30;
   optional bool bool_field_31 = 31;
   optional bool bool_field_32 = 32;
 }
-
-// Reference to a WKT to test (via generated code inspection), the handling
-// of #imports.  Within the WKTs, references to each other are just path
-// based imports, but when reference from another proto file, they should be
-// conditional to support the framework import style.
-message WKTRefereceMessage {
-  optional google.protobuf.Any an_any = 1;
-}