remove special handling for protobuf in favor of fixing it

Author: bshaffer

dev/src/Command/DocFxCommand.php

@@ -297,10 +297,7 @@ private function validate(ClassNode $class, OutputInterface $output): bool
     {
         $valid = true;
         $emptyRef = '<options=bold>empty</>';
-        $isGenerated = $class->isProtobufMessageClass()
-            || $class->isProtobufEnumClass()
-            || $class->isServiceClass()
-            || $class->isProtobufLibrary();
+        $isGenerated = $class->isProtobufMessageClass() || $class->isProtobufEnumClass() || $class->isServiceClass();
         foreach (array_merge([$class], $class->getMethods(), $class->getConstants()) as $node) {
             foreach ($this->getInvalidXrefs($node->getContent()) as $invalidRef) {
                 if (isset(self::$allowedReferenceFailures[$node->getFullname()])

dev/src/DocFx/Node/ClassNode.php

@@ -70,11 +70,6 @@ public function isProtobufMessageClass(): bool
         return false;
     }
 
-    public function isProtobufLibrary(): bool
-    {
-        return 0 === strpos($this->getNamespace(), '\Google\Protobuf');
-    }
-
     public function isGapicEnumClass(): bool
     {
         // returns true if the class extends \Google\Protobuf\Internal\Message