Remove runtime flags for Proxy and Reflect

test/mjsunit/es6/reflect-get-own-property-descriptor.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 12 matching lines @@
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // This file only tests very simple descriptors that always have
 // configurable, enumerable, and writable set to true.
 
 // This is adapted from mjsunit/get-own-property-descriptor.js.
 
-// Flags: --harmony-reflect
-
 function get() { return x; }
 function set(x) { this.x = x; }
 
 var obj = {x: 1};
 obj.__defineGetter__("accessor", get);
 obj.__defineSetter__("accessor", set);
 var a = new Array();
 a[1] = 42;
 obj[1] = 42;
 
@@ skipping 69 matching lines @@
 function el_getter() { return 239; };
 function el_setter() {};
 Object.defineProperty(global, '239', {get: el_getter, set: el_setter});
 
 var descRegularElement = Reflect.getOwnPropertyDescriptor(global, '42');
 assertEquals(42, descRegularElement.value);
 
 var descAccessorElement = Reflect.getOwnPropertyDescriptor(global, '239');
 assertEquals(el_getter, descAccessorElement.get);
 assertEquals(el_setter, descAccessorElement.set);