Mode clean-up pt 1: rename classic/non-strict mode to sloppy mode

test/mjsunit/harmony/proxies-example-membrane.js

 // Copyright 2011 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 54 matching lines @@
         });
         return result;
       }
       // As long as obj is not frozen, the proxy won't allow itself to be fixed
       return undefined; // will cause a TypeError to be thrown
     },
     has: function(name) { return name in obj; },
     hasOwn: function(name) { return ({}).hasOwnProperty.call(obj, name); },
     get: function(receiver, name) { return obj[name]; },
     set: function(receiver, name, val) {
-      obj[name] = val;  // bad behavior when set fails in non-strict mode
+      obj[name] = val;  // bad behavior when set fails in sloppy mode
       return true;
     },
     enumerate: function() {
       var result = [];
       for (var name in obj) { result.push(name); };
       return result;
     },
     keys: function() { return Object.keys(obj); }
   };
 }
@@ skipping 417 matching lines @@
 assertThrows(function() { w[1] }, Error)
 assertThrows(function() { w.c }, Error)
 assertThrows(function() { wb.bb }, Error)
 assertEquals(3, wr.a)
 assertThrows(function() { wf(4) }, Error)
 assertEquals(6, wfx.a)
 assertEquals(7, wgx.aa)
 assertThrows(function() { wh4.q }, Error)
 assertThrows(function() { ws5.x }, Error)
 assertThrows(function() { ws5x.y }, Error)