base: Fix the TODO in ListValue::Remove().

base/values_unittest.cc

Index: base/values_unittest.cc
diff --git a/base/values_unittest.cc b/base/values_unittest.cc
index b5bcbe1ae20ca612e16ade2152d0a715651d4be7..553e8e15080a083712232ee45b21b077e6fb99de 100644
--- a/base/values_unittest.cc
+++ b/base/values_unittest.cc
@@ -236,7 +236,9 @@ TEST(ValuesTest, ListRemoval) {
     DeletionTestValue* value = new DeletionTestValue(&deletion_flag);
     list.Append(value);
     EXPECT_FALSE(deletion_flag);
-    EXPECT_EQ(0, list.Remove(*value));
+    size_t index = 0;
+    list.Remove(*value, &index);
+    EXPECT_EQ(0U, index);
     EXPECT_TRUE(deletion_flag);
     EXPECT_EQ(0U, list.GetSize());
   }