Remove @Beta from setFuture.

RELNOTES=Removed `@Beta` from `setFuture`.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=251241741

Author: cpovirk

android/guava/src/com/google/common/util/concurrent/AbstractFuture.java

@@ -777,7 +777,6 @@ protected boolean setException(Throwable throwable) {
    *     cancelled or set.
    * @since 19.0
    */
-  @Beta
   @CanIgnoreReturnValue
   protected boolean setFuture(ListenableFuture<? extends V> future) {
     checkNotNull(future);

android/guava/src/com/google/common/util/concurrent/SettableFuture.java

@@ -14,7 +14,6 @@
 
 package com.google.common.util.concurrent;
 
-import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import org.checkerframework.checker.nullness.compatqual.NullableDecl;
@@ -54,7 +53,6 @@ public boolean setException(Throwable throwable) {
     return super.setException(throwable);
   }
 
-  @Beta
   @CanIgnoreReturnValue
   @Override
   public boolean setFuture(ListenableFuture<? extends V> future) {

guava/src/com/google/common/util/concurrent/AbstractFuture.java

@@ -777,7 +777,6 @@ protected boolean setException(Throwable throwable) {
    *     cancelled or set.
    * @since 19.0
    */
-  @Beta
   @CanIgnoreReturnValue
   protected boolean setFuture(ListenableFuture<? extends V> future) {
     checkNotNull(future);

guava/src/com/google/common/util/concurrent/SettableFuture.java

@@ -14,7 +14,6 @@
 
 package com.google.common.util.concurrent;
 
-import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import org.checkerframework.checker.nullness.qual.Nullable;
@@ -54,7 +53,6 @@ public boolean setException(Throwable throwable) {
     return super.setException(throwable);
   }
 
-  @Beta
   @CanIgnoreReturnValue
   @Override
   public boolean setFuture(ListenableFuture<? extends V> future) {