Revert of Rename String.prototype.contains to 'includes'.

test/js-perf-test/Strings/harmony-string.js

Index: test/js-perf-test/Strings/harmony-string.js
diff --git a/test/js-perf-test/Strings/harmony-string.js b/test/js-perf-test/Strings/harmony-string.js
index c2eac4ee33d4f4578b3f34f5fbbc5c35130d9033..f430ab45789d2064e7a744cfc609a6c730452bb5 100644
--- a/test/js-perf-test/Strings/harmony-string.js
+++ b/test/js-perf-test/Strings/harmony-string.js
@@ -9,8 +9,8 @@
                 StartsWith, WithSetup, WithTearDown),
   new Benchmark('StringEndsWith', false, false, 0,
                 EndsWith, WithSetup, WithTearDown),
-  new Benchmark('StringIncludes', false, false, 0,
-                Includes, IncludesSetup, WithTearDown),
+  new Benchmark('StringContains', false, false, 0,
+                Contains, ContainsSetup, WithTearDown),
   new Benchmark('StringFromCodePoint', false, false, 0,
                 FromCodePoint, FromCodePointSetup, FromCodePointTearDown),
   new Benchmark('StringCodePointAt', false, false, 0,
@@ -60,13 +60,13 @@
   result = str.endsWith(substr);
 }
 
-function IncludesSetup() {
+function ContainsSetup() {
   str = "def".repeat(100) + "abc".repeat(100) + "qqq".repeat(100);
   substr = "abc".repeat(100);
 }
 
-function Includes() {
-  result = str.includes(substr);
+function Contains() {
+  result = str.contains(substr);
 }
 
 var MAX_CODE_POINT = 0xFFFFF;