[wasm] Reduce usage of old Wasm.* API in JS tests.

test/mjsunit/wasm/exceptions.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 --wasm-eh-prototype
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
 // The following methods do not attempt to catch the exception they raise.
@@ skipping 88 matching lines @@
       throw 10.5;
     }
     var kJSThrowFP = builder.addImport("throw_fp", sig_index);
 
     // Helper function that throws a large number. Wasm should not catch it.
     function throw_large() {
       throw 1e+28;
     }
     var kJSThrowLarge = builder.addImport("throw_large", sig_index);
 
-    // Helper function for throwing from Wasm.
+    // Helper function for throwing from WebAssembly.
     var kWasmThrowFunction =
       builder.addFunction("throw", kSig_v_i)
         .addBody([
           kExprGetLocal, 0,
           kExprThrow
         ])
         .index;
 
     // Scenario 1: Throw and catch appear on the same function. This should
     // happen in case of inlining, for example.
@@ skipping 254 matching lines @@
 assertEquals(-1, test_catch.exports.from_direct_callee(0xFFFFFFFF));
 assertEquals(0x7FFFFFFF, test_catch.exports.from_direct_callee(0x7FFFFFFF));
 assertEquals(-10, test_catch.exports.from_indirect_callee(10));
 assertEquals(-77, test_catch.exports.from_indirect_callee(77));
 assertEquals(10, test_catch.exports.from_js(10));
 assertEquals(-10, test_catch.exports.from_js(-10));
 
 assertThrowsEquals(test_catch.exports.string_from_js, "use wasm;");
 assertThrowsEquals(test_catch.exports.large_from_js, 1e+28);
 assertThrowsEquals(test_catch.exports.undefined_from_js, undefined);