Remove harmony-strings flag.

test/mjsunit/es6/string-startswith.js

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-// Flags: --harmony-strings
-
 assertEquals(1, String.prototype.startsWith.length);
 
 var testString = "Hello World";
 assertTrue(testString.startsWith(""));
 assertTrue(testString.startsWith("Hello"));
 assertFalse(testString.startsWith("hello"));
 assertFalse(testString.startsWith("Hello World!"));
 assertFalse(testString.startsWith(null));
 assertFalse(testString.startsWith(undefined));
 
@@ skipping 354 matching lines @@
 assertThrows(function() {
   String.prototype.startsWith.apply({
     "toString": function() { throw RangeError(); }
   }, [/./]);
 }, RangeError);
 assertThrows(function() {
   String.prototype.startsWith.apply({
     "toString": function() { return "abc"; }
   }, [/./]);
 }, TypeError);