Remove redundant initializers from WebRTC Java code.

Removes redundant field initializers such as null, 0 and false.

Bug: webrtc:9742
Change-Id: I1e54f6c6000885cf95f7af8e2701875a78445497
Reviewed-on: https://webrtc-review.googlesource.com/99481
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24676}
diff --git a/sdk/android/api/org/webrtc/MediaCodecVideoDecoder.java b/sdk/android/api/org/webrtc/MediaCodecVideoDecoder.java
index aa87cdb..ec65475 100644
--- a/sdk/android/api/org/webrtc/MediaCodecVideoDecoder.java
+++ b/sdk/android/api/org/webrtc/MediaCodecVideoDecoder.java
@@ -21,9 +21,9 @@
 import android.view.Surface;
 import java.nio.ByteBuffer;
 import java.util.ArrayDeque;
-import java.util.HashMap;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Queue;
@@ -156,9 +156,9 @@
   private static final int MAX_QUEUED_OUTPUTBUFFERS = 3;
   // Active running decoder instance. Set in initDecode() (called from native code)
   // and reset to null in release() call.
-  @Nullable private static MediaCodecVideoDecoder runningInstance = null;
-  @Nullable private static MediaCodecVideoDecoderErrorCallback errorCallback = null;
-  private static int codecErrors = 0;
+  @Nullable private static MediaCodecVideoDecoder runningInstance;
+  @Nullable private static MediaCodecVideoDecoderErrorCallback errorCallback;
+  private static int codecErrors;
   // List of disabled codec types - can be set from application.
   private static Set<String> hwDecoderDisabledTypes = new HashSet<String>();
   @Nullable private static EglBase eglBase;
@@ -228,7 +228,7 @@
   // The below variables are only used when decoding to a Surface.
   @Nullable private TextureListener textureListener;
   private int droppedFrames;
-  @Nullable private Surface surface = null;
+  @Nullable private Surface surface;
   private final Queue<DecodedOutputBuffer> dequeuedSurfaceOutputBuffers =
       new ArrayDeque<DecodedOutputBuffer>();