diff --git a/runners/google-cloud-dataflow-java/pom.xml b/runners/google-cloud-dataflow-java/pom.xml
index f679976528534..073cee8085a53 100644
--- a/runners/google-cloud-dataflow-java/pom.xml
+++ b/runners/google-cloud-dataflow-java/pom.xml
@@ -293,12 +293,6 @@
       <artifactId>google-http-client-jackson2</artifactId>
     </dependency>
 
-    <dependency>
-      <groupId>com.google.http-client</groupId>
-      <artifactId>google-http-client-protobuf</artifactId>
-      <scope>runtime</scope>
-    </dependency>
-
     <dependency>
       <groupId>com.google.apis</groupId>
       <artifactId>google-api-services-dataflow</artifactId>
@@ -352,11 +346,6 @@
       <artifactId>joda-time</artifactId>
     </dependency>
 
-    <dependency>
-      <groupId>com.google.protobuf</groupId>
-      <artifactId>protobuf-java</artifactId>
-    </dependency>
-
     <dependency>
       <groupId>com.google.code.findbugs</groupId>
       <artifactId>jsr305</artifactId>
diff --git a/runners/google-cloud-dataflow-java/src/main/java/org/apache/beam/runners/dataflow/internal/CustomSources.java b/runners/google-cloud-dataflow-java/src/main/java/org/apache/beam/runners/dataflow/internal/CustomSources.java
index 0d9356655928b..ad2a6668daa26 100755
--- a/runners/google-cloud-dataflow-java/src/main/java/org/apache/beam/runners/dataflow/internal/CustomSources.java
+++ b/runners/google-cloud-dataflow-java/src/main/java/org/apache/beam/runners/dataflow/internal/CustomSources.java
@@ -25,7 +25,6 @@
 
 import com.google.api.services.dataflow.model.SourceMetadata;
 import com.google.common.annotations.VisibleForTesting;
-import com.google.protobuf.ByteString;
 import java.util.ArrayList;
 import java.util.List;
 import org.apache.beam.runners.dataflow.options.DataflowPipelineOptions;
@@ -47,20 +46,9 @@
 public class CustomSources {
   private static final String SERIALIZED_SOURCE = "serialized_source";
   @VisibleForTesting static final String SERIALIZED_SOURCE_SPLITS = "serialized_source_splits";
-  /**
-   * The current limit on the size of a ReportWorkItemStatus RPC to Google Cloud Dataflow, which
-   * includes the initial splits, is 20 MB.
-   */
-  public static final long DATAFLOW_SPLIT_RESPONSE_API_SIZE_BYTES = 20 * (1 << 20);
 
   private static final Logger LOG = LoggerFactory.getLogger(CustomSources.class);
 
-  private static final ByteString firstSplitKey = ByteString.copyFromUtf8("0000000000000001");
-
-  public static boolean isFirstUnboundedSourceSplit(ByteString splitKey) {
-    return splitKey.equals(firstSplitKey);
-  }
-
   private static int getDesiredNumUnboundedSourceSplits(DataflowPipelineOptions options) {
     int cores = 4; //TODO: decide at runtime?
     if (options.getMaxNumWorkers() > 0) {