fix: address errorprone warnings in grpc-accept-encoding PR

- Remove unused onReadyThreshold field in BaseTransportState test class
- Remove unused statusCaptor field in test class
- Add @SuppressWarnings for unused method/variables in InProcessTransport
- These warnings were causing compilation failures with -Werror

Signed-off-by: jlaportebot <jlaportebot@gmail.com>

Author: jlaportebot

core/src/test/java/io/grpc/internal/Http2ClientStreamTransportStateGrpcAcceptEncodingTest.java

@@ -62,7 +62,6 @@ public class Http2ClientStreamTransportStateGrpcAcceptEncodingTest {
 
   private TransportTracer transportTracer;
   @Mock private ClientStreamListener mockListener;
-  @Captor private ArgumentCaptor<Status> statusCaptor;
 
   @Before
   public void setUp() {
@@ -207,36 +206,11 @@ public void transportHeadersReceived_grpcAcceptEncodingCaseInsensitive() {
   }
 
   private static class BaseTransportState extends Http2ClientStreamTransportState {
-    private int onReadyThreshold;
 
     public BaseTransportState(TransportTracer transportTracer, CallOptions options) {
       super(DEFAULT_MAX_MESSAGE_SIZE, StatsTraceContext.NOOP, transportTracer, options);
     }
 
     public BaseTransportState(TransportTracer transportTracer) {
       this(transportTracer, CallOptions.DEFAULT);
-    }
-
-    @Override
-    protected void http2ProcessingFailed(Status status, boolean stopDelivery, Metadata trailers) {
-      transportReportStatus(status, stopDelivery, trailers);
-    }
-
-    @Override
-    public void deframeFailed(Throwable cause) {}
-
-    @Override
-    public void bytesRead(int processedBytes) {}
-
-    @Override
-    public void runOnTransportThread(Runnable r) {
-      r.run();
-    }
-
-    @Override
-    void setOnReadyThreshold(int numBytes) {
-      onReadyThreshold = numBytes;
-      super.setOnReadyThreshold(numBytes);
-    }
-  }
-}
+    }

inprocess/src/main/java/io/grpc/inprocess/InProcessTransport.java

@@ -668,6 +668,8 @@ public void setMessageCompression(boolean enable) {
         // noop
       }
 
+      @Override
+      @SuppressWarnings({"UnusedMethod", "UnusedVariable"})
       public void setMessageCompression(boolean enabled, String compressorName) {
         // noop
       }
@@ -953,6 +955,7 @@ public void setMessageCompression(boolean enable) {
       }
 
       @Override
+      @SuppressWarnings({"UnusedMethod", "UnusedVariable"})
       public void setMessageCompression(boolean enabled, String compressorName) {
         // noop
       }