Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/src/google/protobuf/util/internal/utility.h

Index: third_party/protobuf/src/google/protobuf/util/internal/utility.h
diff --git a/third_party/protobuf/src/google/protobuf/util/internal/utility.h b/third_party/protobuf/src/google/protobuf/util/internal/utility.h
index 667e660c581ebdf3c3b7359e90505ef1cbf236cc..33df8edad268241102d0f149ea057264a43b5401 100644
--- a/third_party/protobuf/src/google/protobuf/util/internal/utility.h
+++ b/third_party/protobuf/src/google/protobuf/util/internal/utility.h
@@ -64,10 +64,6 @@ class EnumValue;
 namespace protobuf {
 namespace util {
 namespace converter {
-
-// Size of "type.googleapis.com"
-static const int64 kTypeUrlSize = 19;
-
 // Finds the tech option identified by option_name. Parses the boolean value and
 // returns it.
 // When the option with the given name is not found, default_value is returned.
@@ -136,10 +132,6 @@ const google::protobuf::Field* FindFieldInTypeOrNull(
 const google::protobuf::Field* FindJsonFieldInTypeOrNull(
     const google::protobuf::Type* type, StringPiece json_name);
 
-// Similar to FindFieldInTypeOrNull, but this looks up fields by number.
-const google::protobuf::Field* FindFieldInTypeByNumberOrNull(
-    const google::protobuf::Type* type, int32 number);
-
 // Finds and returns the EnumValue identified by enum_name in the passed tech
 // Enum object. Returns NULL if none found.
 const google::protobuf::EnumValue* FindEnumValueByNameOrNull(
@@ -150,13 +142,6 @@ const google::protobuf::EnumValue* FindEnumValueByNameOrNull(
 const google::protobuf::EnumValue* FindEnumValueByNumberOrNull(
     const google::protobuf::Enum* enum_type, int32 value);
 
-// Finds and returns the EnumValue identified by enum_name without underscore in
-// the passed tech Enum object. Returns NULL if none found.
-// For Ex. if enum_name is ACTIONANDADVENTURE it can get accepted if
-// EnumValue's name is action_and_adventure or ACTION_AND_ADVENTURE.
-const google::protobuf::EnumValue* FindEnumValueByNameWithoutUnderscoreOrNull(
-    const google::protobuf::Enum* enum_type, StringPiece enum_name);
-
 // Converts input to camel-case and returns it.
 LIBPROTOBUF_EXPORT string ToCamelCase(const StringPiece input);