[Cronet] Remove unused ping and windowUpdate methods

components/cronet/android/java/src/org/chromium/net/CronetBidirectionalStream.java

Index: components/cronet/android/java/src/org/chromium/net/CronetBidirectionalStream.java
diff --git a/components/cronet/android/java/src/org/chromium/net/CronetBidirectionalStream.java b/components/cronet/android/java/src/org/chromium/net/CronetBidirectionalStream.java
index 06773b2b0dbd60b6c0e671544408807a78494e02..11474481dbfc04a05ca02b7dd125a7f4ee822303 100644
--- a/components/cronet/android/java/src/org/chromium/net/CronetBidirectionalStream.java
+++ b/components/cronet/android/java/src/org/chromium/net/CronetBidirectionalStream.java
@@ -403,18 +403,6 @@ class CronetBidirectionalStream extends BidirectionalStream {
     }
 
     @Override
-    public void ping(PingCallback callback, Executor executor) {
-        // TODO(mef): May be last thing to be implemented on Android.
-        throw new UnsupportedOperationException("ping is not supported yet.");
-    }
-
-    @Override
-    public void windowUpdate(int windowSizeIncrement) {
-        // TODO(mef): Understand the needs and semantics of this method.
-        throw new UnsupportedOperationException("windowUpdate is not supported yet.");
-    }
-
-    @Override
     public void cancel() {
         synchronized (mNativeStreamLock) {
             if (isDoneLocked() || mReadState == State.NOT_STARTED) {