Cronet API Refactoring

components/cronet/android/api/src/org/chromium/net/UploadDataSink.java

Index: components/cronet/android/api/src/org/chromium/net/UploadDataSink.java
diff --git a/components/cronet/android/api/src/org/chromium/net/UploadDataSink.java b/components/cronet/android/api/src/org/chromium/net/UploadDataSink.java
index 213ccefe74623f9b0aa3c082854fcf0252ff82d2..5474559635fbab71956a5bcdb353976bdf00dcfa 100644
--- a/components/cronet/android/api/src/org/chromium/net/UploadDataSink.java
+++ b/components/cronet/android/api/src/org/chromium/net/UploadDataSink.java
@@ -5,32 +5,32 @@
 package org.chromium.net;
 
 /**
- * Interface with callbacks methods for {@link UploadDataProvider}. All methods
+ * Defines callbacks methods for {@link UploadDataProvider}. All methods
  * may be called synchronously or asynchronously, on any thread.
  */
-public interface UploadDataSink {
+public abstract class UploadDataSink {
     /**
      * Called by {@link UploadDataProvider} when a read succeeds.
      * @param finalChunk For chunked uploads, {@code true} if this is the final
      *     read. It must be {@code false} for non-chunked uploads.
      */
-    public void onReadSucceeded(boolean finalChunk);
+    public abstract void onReadSucceeded(boolean finalChunk);
 
     /**
      * Called by {@link UploadDataProvider} when a read fails.
      * @param exception Exception passed on to the embedder.
      */
-    public void onReadError(Exception exception);
+    public abstract void onReadError(Exception exception);
 
     /**
      * Called by {@link UploadDataProvider} when a rewind succeeds.
      */
-    public void onRewindSucceeded();
+    public abstract void onRewindSucceeded();
 
     /**
      * Called by {@link UploadDataProvider} when a rewind fails, or if rewinding
      * uploads is not supported.
      * @param exception Exception passed on to the embedder.
      */
-    public void onRewindError(Exception exception);
+    public abstract void onRewindError(Exception exception);
 }