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

third_party/protobuf/objectivec/GPBCodedInputStream.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>
-
-@class GPBMessage;
-@class GPBExtensionRegistry;
-
-NS_ASSUME_NONNULL_BEGIN
-
-// Reads and decodes protocol message fields.
-// Subclassing of GPBCodedInputStream is NOT supported.
-@interface GPBCodedInputStream : NSObject
-
-+ (instancetype)streamWithData:(NSData *)data;
-- (instancetype)initWithData:(NSData *)data;
-
-// Attempt to read a field tag, returning zero if we have reached EOF.
-// Protocol message parsers use this to read tags, since a protocol message
-// may legally end wherever a tag occurs, and zero is not a valid tag number.
-- (int32_t)readTag;
-
-- (double)readDouble;
-- (float)readFloat;
-- (uint64_t)readUInt64;
-- (uint32_t)readUInt32;
-- (int64_t)readInt64;
-- (int32_t)readInt32;
-- (uint64_t)readFixed64;
-- (uint32_t)readFixed32;
-- (int32_t)readEnum;
-- (int32_t)readSFixed32;
-- (int64_t)readSFixed64;
-- (int32_t)readSInt32;
-- (int64_t)readSInt64;
-- (BOOL)readBool;
-- (NSString *)readString;
-- (NSData *)readBytes;
-
-// Read an embedded message field value from the stream.
-- (void)readMessage:(GPBMessage *)message
-    extensionRegistry:(nullable GPBExtensionRegistry *)extensionRegistry;
-
-// Reads and discards a single field, given its tag value. Returns NO if the
-// tag is an endgroup tag, in which case nothing is skipped.  Otherwise,
-// returns YES.
-- (BOOL)skipField:(int32_t)tag;
-
-// Reads and discards an entire message.  This will read either until EOF
-// or until an endgroup tag, whichever comes first.
-- (void)skipMessage;
-
-// Verifies that the last call to readTag() returned the given tag value.
-// This is used to verify that a nested group ended with the correct end tag.
-// Throws NSParseErrorException if value does not match the last tag.
-- (void)checkLastTagWas:(int32_t)value;
-
-@end
-
-NS_ASSUME_NONNULL_END