inprocess: mark all classes final

diff --git a/core/src/main/java/io/grpc/inprocess/InProcessServerBuilder.java b/core/src/main/java/io/grpc/inprocess/InProcessServerBuilder.java
index 0ed32dc..cb5bcfa 100644
--- a/core/src/main/java/io/grpc/inprocess/InProcessServerBuilder.java
+++ b/core/src/main/java/io/grpc/inprocess/InProcessServerBuilder.java
@@ -31,7 +31,7 @@
  */
 @ExperimentalApi("https://github.com/grpc/grpc-java/issues/1783")
 public final class InProcessServerBuilder
-        extends AbstractServerImplBuilder<InProcessServerBuilder> {
+    extends AbstractServerImplBuilder<InProcessServerBuilder> {
   /**
    * Create a server builder that will bind with the given name.
    *