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

third_party/protobuf/objectivec/GPBMessage.h

-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 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.
-
-#import <Foundation/Foundation.h>
-
-#import "GPBBootstrap.h"
-
-@class GPBDescriptor;
-@class GPBCodedInputStream;
-@class GPBCodedOutputStream;
-@class GPBExtensionDescriptor;
-@class GPBExtensionRegistry;
-@class GPBFieldDescriptor;
-@class GPBUnknownFieldSet;
-
-NS_ASSUME_NONNULL_BEGIN
-
-CF_EXTERN_C_BEGIN
-
-// NSError domain used for errors.
-extern NSString *const GPBMessageErrorDomain;
-
-typedef NS_ENUM(NSInteger, GPBMessageErrorCode) {
-  GPBMessageErrorCodeMalformedData = -100,
-  GPBMessageErrorCodeMissingRequiredField = -101,
-};
-
-// In DEBUG ONLY, an NSException is thrown when a parsed message doesn't
-// contain required fields. This key allows you to retrieve the parsed message
-// from the exception's |userInfo| dictionary.
-#ifdef DEBUG
-extern NSString *const GPBExceptionMessageKey;
-#endif  // DEBUG
-
-CF_EXTERN_C_END
-
-@interface GPBMessage : NSObject<NSSecureCoding, NSCopying>
-
-// NOTE: If you add a instance method/property to this class that may conflict
-// with methods declared in protos, you need to update objective_helpers.cc.
-// The main cases are methods that take no arguments, or setFoo:/hasFoo: type
-// methods.
-
-@property(nonatomic, copy, nullable) GPBUnknownFieldSet *unknownFields;
-
-// Are all required fields in the message and all embedded messages set.
-@property(nonatomic, readonly, getter=isInitialized) BOOL initialized;
-
-// Returns an autoreleased instance.
-+ (instancetype)message;
-
-// Create a message based on a variety of inputs.  If there is a data parse
-// error, nil is returned and if not NULL, errorPtr is filled in.
-// NOTE: In DEBUG ONLY, the message is also checked for all required field,
-// if one is missing, the parse will fail (returning nil, filling in errorPtr).
-+ (instancetype)parseFromData:(NSData *)data error:(NSError **)errorPtr;
-+ (instancetype)parseFromData:(NSData *)data
-            extensionRegistry:(nullable GPBExtensionRegistry *)extensionRegistry
-                        error:(NSError **)errorPtr;
-+ (instancetype)parseFromCodedInputStream:(GPBCodedInputStream *)input
-                        extensionRegistry:
-                            (nullable GPBExtensionRegistry *)extensionRegistry
-                                    error:(NSError **)errorPtr;
-
-// Create a message based on delimited input.  If there is a data parse
-// error, nil is returned and if not NULL, errorPtr is filled in.
-+ (instancetype)parseDelimitedFromCodedInputStream:(GPBCodedInputStream *)input
-                                 extensionRegistry:
-                                     (nullable GPBExtensionRegistry *)extensionRegistry
-                                             error:(NSError **)errorPtr;
-
-// If there is a data parse error, nil is returned and if not NULL, errorPtr is
-// filled in.
-// NOTE: In DEBUG ONLY, the message is also checked for all required field,
-// if one is missing, the parse will fail (returning nil, filling in errorPtr).
-- (instancetype)initWithData:(NSData *)data error:(NSError **)errorPtr;
-- (instancetype)initWithData:(NSData *)data
-           extensionRegistry:(nullable GPBExtensionRegistry *)extensionRegistry
-                       error:(NSError **)errorPtr;
-- (instancetype)initWithCodedInputStream:(GPBCodedInputStream *)input
-                       extensionRegistry:
-                           (nullable GPBExtensionRegistry *)extensionRegistry
-                                   error:(NSError **)errorPtr;
-
-// Serializes the message and writes it to output.
-- (void)writeToCodedOutputStream:(GPBCodedOutputStream *)output;
-- (void)writeToOutputStream:(NSOutputStream *)output;
-
-// Serializes the message and writes it to output, but writes the size of the
-// message as a variant before writing the message.
-- (void)writeDelimitedToCodedOutputStream:(GPBCodedOutputStream *)output;
-- (void)writeDelimitedToOutputStream:(NSOutputStream *)output;
-
-// Serializes the message to an NSData. Note that this value is not cached, so
-// if you are using it repeatedly, cache it yourself. If there is an error
-// while generating the data, nil is returned.
-// NOTE: In DEBUG ONLY, the message is also checked for all required field,
-// if one is missing, nil will be returned.
-- (nullable NSData *)data;
-
-// Same as -[data], except a delimiter is added to the start of the data
-// indicating the size of the message data that follows.
-- (nullable NSData *)delimitedData;
-
-// Returns the size of the object if it were serialized.
-// This is not a cached value. If you are following a pattern like this:
-//   size_t size = [aMsg serializedSize];
-//   NSMutableData *foo = [NSMutableData dataWithCapacity:size + sizeof(size)];
-//   [foo writeSize:size];
-//   [foo appendData:[aMsg data]];
-// you would be better doing:
-//   NSData *data = [aMsg data];
-//   NSUInteger size = [aMsg length];
-//   NSMutableData *foo = [NSMutableData dataWithCapacity:size + sizeof(size)];
-//   [foo writeSize:size];
-//   [foo appendData:data];
-- (size_t)serializedSize;
-
-// Return the descriptor for the message
-+ (GPBDescriptor *)descriptor;
-- (GPBDescriptor *)descriptor;
-
-// Extensions use boxed values (NSNumbers) for PODs, NSMutableArrays for
-// repeated. If the extension is a Message one will be auto created for you
-// and returned similar to fields.
-- (BOOL)hasExtension:(GPBExtensionDescriptor *)extension;
-- (nullable id)getExtension:(GPBExtensionDescriptor *)extension;
-- (void)setExtension:(GPBExtensionDescriptor *)extension value:(nullable id)value;
-- (void)addExtension:(GPBExtensionDescriptor *)extension value:(id)value;
-- (void)setExtension:(GPBExtensionDescriptor *)extension
-               index:(NSUInteger)index
-               value:(id)value;
-- (void)clearExtension:(GPBExtensionDescriptor *)extension;
-
-// Resets all fields to their default values.
-- (void)clear;
-
-// Parses a message of this type from the input and merges it with this
-// message.
-// NOTE: This will throw if there is an error parsing the data.
-- (void)mergeFromData:(NSData *)data
-    extensionRegistry:(nullable GPBExtensionRegistry *)extensionRegistry;
-
-// Merges the fields from another message (of the same type) into this
-// message.
-- (void)mergeFrom:(GPBMessage *)other;
-
-@end
-
-NS_ASSUME_NONNULL_END