Update third_party/protobuf to protobuf-v3.0.0-beta-3

third_party/protobuf/objectivec/GPBCodedInputStream.m

 // 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.
@@ skipping 201 matching lines @@
     GPBCodedInputStreamState *state) {
   int32_t size = ReadRawVarint32(state);
   NSString *result;
   if (size == 0) {
     result = @"";
   } else {
     CheckSize(state, size);
     result = [[NSString alloc] initWithBytes:&state->bytes[state->bufferPos]
                                       length:size
                                     encoding:NSUTF8StringEncoding];
+    state->bufferPos += size;
     if (!result) {
-      result = @"";
 #ifdef DEBUG
       // https://developers.google.com/protocol-buffers/docs/proto#scalar
-      NSLog(@"UTF8 failure, is some field type 'string' when it should be "
+      NSLog(@"UTF-8 failure, is some field type 'string' when it should be "
             @"'bytes'?");
 #endif
+      [NSException raise:NSParseErrorException
+                  format:@"Invalid UTF-8 for a 'string'"];
     }
-    state->bufferPos += size;
   }
   return result;
 }
 
 NSData *GPBCodedInputStreamReadRetainedBytes(GPBCodedInputStreamState *state) {
   int32_t size = ReadRawVarint32(state);
   if (size < 0) return nil;
   CheckSize(state, size);
   NSData *result = [[NSData alloc] initWithBytes:state->bytes + state->bufferPos
                                           length:size];
@@ skipping 111 matching lines @@
 
 - (void)skipMessage {
   while (YES) {
     int32_t tag = GPBCodedInputStreamReadTag(&state_);
     if (tag == 0 || ![self skipField:tag]) {
       return;
     }
   }
 }
 
+- (BOOL)isAtEnd {
+  return GPBCodedInputStreamIsAtEnd(&state_);
+}
+
+- (size_t)position {
+  return state_.bufferPos;
+}
+
 - (double)readDouble {
   return GPBCodedInputStreamReadDouble(&state_);
 }
 
 - (float)readFloat {
   return GPBCodedInputStreamReadFloat(&state_);
 }
 
 - (uint64_t)readUInt64 {
   return GPBCodedInputStreamReadUInt64(&state_);
@@ skipping 109 matching lines @@
 
 - (int32_t)readSInt32 {
   return GPBCodedInputStreamReadSInt32(&state_);
 }
 
 - (int64_t)readSInt64 {
   return GPBCodedInputStreamReadSInt64(&state_);
 }
 
 @end