Revert of Revert of Set the javac target and source to 1.7

base/android/java/src/org/chromium/base/CollectionUtil.java

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.base;
 
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashSet;
 
 /**
  * Functions used for easier initialization of Java collections. Inspired by
  * functionality in com.google.common.collect in Guava but cherry-picked to
  * bare-minimum functionality to avoid bloat. (http://crbug.com/272790 provides
  * further details)
  */
 public final class CollectionUtil {
     private CollectionUtil() {}
 
+    @SafeVarargs
     public static <E> HashSet<E> newHashSet(E... elements) {
         HashSet<E> set = new HashSet<E>(elements.length);
         Collections.addAll(set, elements);
         return set;
     }
 
+    @SafeVarargs
     public static <E> ArrayList<E> newArrayList(E... elements) {
         ArrayList<E> list = new ArrayList<E>(elements.length);
         Collections.addAll(list, elements);
         return list;
     }
 
     public static <E> ArrayList<E> newArrayList(Iterable<E> iterable) {
         ArrayList<E> list = new ArrayList<E>();
         for (E element : iterable) {
             list.add(element);
         }
         return list;
     }
 }