Mark DeltaWindowEntry methods final

This class and all of its methods are only package visible.
Clarify the methods as final for the benefit of the JIT to
inline trivial code.

Change-Id: I078841f9900dbf299fbe6abf2599f0208ae96856

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/DeltaWindowEntry.java

@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.internal.storage.pack;
 
-class DeltaWindowEntry {
+final class DeltaWindowEntry {
 	ObjectToPack object;
 
 	/** Complete contents of this object. Lazily loaded. */
@@ -52,29 +52,29 @@ class DeltaWindowEntry {
 	/** Index of this object's content, to encode other deltas. Lazily loaded. */
 	DeltaIndex index;
 
-	void set(ObjectToPack object) {
+	final void set(ObjectToPack object) {
 		this.object = object;
 		this.index = null;
 		this.buffer = null;
 	}
 
 	/** @return current delta chain depth of this object. */
-	int depth() {
+	final int depth() {
 		return object.getDeltaDepth();
 	}
 
 	/** @return type of the object in this window entry. */
-	int type() {
+	final int type() {
 		return object.getType();
 	}
 
 	/** @return estimated unpacked size of the object, in bytes . */
-	int size() {
+	final int size() {
 		return object.getWeight();
 	}
 
 	/** @return true if there is no object stored in this entry. */
-	boolean empty() {
+	final boolean empty() {
 		return object == null;
 	}
 }