[wasm] Rename the WASM object to _WASMEXP_.

test/mjsunit/wasm/ffi-error.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --expose-wasm
 
 load("test/mjsunit/wasm/wasm-constants.js");
 
 function testCallFFI(ffi) {
   var kBodySize = 6;
@@ skipping 20 matching lines @@
     kExprCallFunction, 0,       // --
     kExprGetLocal, 0,           // --
     kExprGetLocal, 1,           // --
     // names
     kDeclEnd,
     'f', 'u', 'n', 0,           //  --
     'm', 'a', 'i', 'n', 0       //  --
   );
 
   print("instantiate FFI");
-  var module = WASM.instantiateModule(data, ffi);
+  var module = _WASMEXP_.instantiateModule(data, ffi);
 }
 
 // everything is good.
 (function() {
   var ffi = new Object();
   ffi.fun = function(a, b) { print(a, b); }
   testCallFFI(ffi);
 })();
 
 
@@ skipping 18 matching lines @@
   testCallFFI(ffi);
 });
 
 
 // "fun" should be a JS function.
 assertThrows(function() {
   var ffi = new Object();
   ffi.fun = 0;
   testCallFFI(ffi);
 });