Remove harmony-strings flag.

test/mjsunit/es6/string-startswith.js

Index: test/mjsunit/es6/string-startswith.js
diff --git a/test/mjsunit/harmony/string-startswith.js b/test/mjsunit/es6/string-startswith.js
similarity index 99%
rename from test/mjsunit/harmony/string-startswith.js
rename to test/mjsunit/es6/string-startswith.js
index d72f2946f594e5f1ee2fbbf08d2e4c7ee4c6d4b2..887db994a03fcd02ed5d79b5cf00e3e0c7ca43c3 100644
--- a/test/mjsunit/harmony/string-startswith.js
+++ b/test/mjsunit/es6/string-startswith.js
@@ -25,8 +25,6 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --harmony-strings
-
 assertEquals(1, String.prototype.startsWith.length);
 
 var testString = "Hello World";