third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/src/google/protobuf/compiler/java/java_enum_field_lite.cc

Index: third_party/protobuf/src/google/protobuf/compiler/java/java_enum_field_lite.cc
diff --git a/third_party/protobuf/src/google/protobuf/compiler/java/java_enum_field_lite.cc b/third_party/protobuf/src/google/protobuf/compiler/java/java_enum_field_lite.cc
index 908d6db413144a22e7cd09a833bce5a07a14ef30..aa0eb5e829f046f0897643c0283563ad6ad66144 100644
--- a/third_party/protobuf/src/google/protobuf/compiler/java/java_enum_field_lite.cc
+++ b/third_party/protobuf/src/google/protobuf/compiler/java/java_enum_field_lite.cc
@@ -258,7 +258,9 @@ GenerateFieldBuilderInitializationCode(io::Printer* printer)  const {
 
 void ImmutableEnumFieldLiteGenerator::
 GenerateInitializationCode(io::Printer* printer) const {
-  printer->Print(variables_, "$name$_ = $default_number$;\n");
+  if (!IsDefaultValueJavaDefault(descriptor_)) {
+    printer->Print(variables_, "$name$_ = $default_number$;\n");
+  }
 }
 
 void ImmutableEnumFieldLiteGenerator::
@@ -885,8 +887,8 @@ GenerateSerializationCode(io::Printer* printer) const {
   if (descriptor_->options().packed()) {
     printer->Print(variables_,
       "if (get$capitalized_name$List().size() > 0) {\n"
-      "  output.writeRawVarint32($tag$);\n"
-      "  output.writeRawVarint32($name$MemoizedSerializedSize);\n"
+      "  output.writeUInt32NoTag($tag$);\n"
+      "  output.writeUInt32NoTag($name$MemoizedSerializedSize);\n"
       "}\n"
       "for (int i = 0; i < $name$_.size(); i++) {\n"
       "  output.writeEnumNoTag($name$_.getInt(i));\n"
@@ -918,7 +920,7 @@ GenerateSerializedSizeCode(io::Printer* printer) const {
       "if (!get$capitalized_name$List().isEmpty()) {"
       "  size += $tag_size$;\n"
       "  size += com.google.protobuf.CodedOutputStream\n"
-      "    .computeRawVarint32Size(dataSize);\n"
+      "    .computeUInt32SizeNoTag(dataSize);\n"
       "}");
   } else {
     printer->Print(variables_,