[Cronet] Make some test infrastructure public rather than package-private.

components/cronet/android/test/javatests/src/org/chromium/net/TestUrlRequestCallback.java

Index: components/cronet/android/test/javatests/src/org/chromium/net/TestUrlRequestCallback.java
diff --git a/components/cronet/android/test/javatests/src/org/chromium/net/TestUrlRequestCallback.java b/components/cronet/android/test/javatests/src/org/chromium/net/TestUrlRequestCallback.java
index b088cfbecf1cd3c1e1034326400b4e990a31795e..42f98a551d639e81a975b2068c2aa2a49eb4d594 100644
--- a/components/cronet/android/test/javatests/src/org/chromium/net/TestUrlRequestCallback.java
+++ b/components/cronet/android/test/javatests/src/org/chromium/net/TestUrlRequestCallback.java
@@ -27,7 +27,7 @@ import java.util.concurrent.TimeUnit;
  * method to block thread until the request completes on another thread.
  * Allows to cancel, block request or throw an exception from an arbitrary step.
  */
-class TestUrlRequestCallback extends UrlRequest.Callback {
+public class TestUrlRequestCallback extends UrlRequest.Callback {
     public ArrayList<UrlResponseInfo> mRedirectResponseInfoList = new ArrayList<UrlResponseInfo>();
     public ArrayList<String> mRedirectUrlList = new ArrayList<String>();
     public UrlResponseInfo mResponseInfo;