Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/src/google/protobuf/field_mask.proto

Index: third_party/protobuf/src/google/protobuf/field_mask.proto
diff --git a/third_party/protobuf/src/google/protobuf/field_mask.proto b/third_party/protobuf/src/google/protobuf/field_mask.proto
index c68d247c8a478b56567590ff62c6fea8c3bac2cc..6af6dbe89805963c66ae99be1b3affd0dcec8135 100644
--- a/third_party/protobuf/src/google/protobuf/field_mask.proto
+++ b/third_party/protobuf/src/google/protobuf/field_mask.proto
@@ -37,7 +37,7 @@ option java_package = "com.google.protobuf";
 option java_outer_classname = "FieldMaskProto";
 option java_multiple_files = true;
 option objc_class_prefix = "GPB";
-option go_package = "google.golang.org/genproto/protobuf/field_mask;field_mask";
+option java_generate_equals_and_hash = true;
 
 // `FieldMask` represents a set of symbolic field paths, for example:
 //
@@ -82,7 +82,7 @@ option go_package = "google.golang.org/genproto/protobuf/field_mask;field_mask";
 //     }
 //
 // A repeated field is not allowed except at the last position of a
-// paths string.
+// field mask.
 //
 // If a FieldMask object is not present in a get operation, the
 // operation applies to all fields (as if a FieldMask of all fields
@@ -107,58 +107,6 @@ option go_package = "google.golang.org/genproto/protobuf/field_mask;field_mask";
 // describe the updated values, the API ignores the values of all
 // fields not covered by the mask.
 //
-// If a repeated field is specified for an update operation, the existing
-// repeated values in the target resource will be overwritten by the new values.
-// Note that a repeated field is only allowed in the last position of a `paths`
-// string.
-//
-// If a sub-message is specified in the last position of the field mask for an
-// update operation, then the existing sub-message in the target resource is
-// overwritten. Given the target message:
-//
-//     f {
-//       b {
-//         d : 1
-//         x : 2
-//       }
-//       c : 1
-//     }
-//
-// And an update message:
-//
-//     f {
-//       b {
-//         d : 10
-//       }
-//     }
-//
-// then if the field mask is:
-//
-//  paths: "f.b"
-//
-// then the result will be:
-//
-//     f {
-//       b {
-//         d : 10
-//       }
-//       c : 1
-//     }
-//
-// However, if the update mask was:
-//
-//  paths: "f.b.d"
-//
-// then the result would be:
-//
-//     f {
-//       b {
-//         d : 10
-//         x : 2
-//       }
-//       c : 1
-//     }
-//
 // In order to reset a field's value to the default, the field must
 // be in the mask and set to the default value in the provided resource.
 // Hence, in order to reset all fields of a resource, provide a default