[wasm] Implement correct 2-level namespace for imports.

test/mjsunit/wasm/unicode-validation.js

 // Copyright 2016 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");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
 function toByteArray(s) {
@@ skipping 27 matching lines @@
   } catch (e) {
     if (e instanceof URIError) return false;
     throw e;
   }
 }
 
 function checkImportsAndExports(imported_module_name, imported_function_name,
     internal_function_name, exported_function_name, shouldThrow) {
   var builder = new WasmModuleBuilder();
 
-  builder.addImportWithModule(imported_module_name, imported_function_name,
+  builder.addImport(imported_module_name, imported_function_name,
       kSig_v_v);
 
   builder.addFunction(internal_function_name, kSig_v_v)
     .addBody([kExprCallFunction, 0])
     .exportAs(exported_function_name);
 
   // sanity check: does javascript agree with out shouldThrow annotation?
   assertEquals(shouldThrow,
       !isValidUtf8(imported_module_name) ||
           !isValidUtf8(imported_function_name) ||
@@ skipping 54 matching lines @@
 checkAll("some math: (½)² = ¼", false);
 checkAll("中国历史系列条目\n北", false);
 checkAll(toByteArray("\xef\xb7\x8f"), false);
 checkAll(toByteArray("a\xc2\x81\xe1\x80\xbf\xf1\x80\xa0\xbf"), false);
 checkAll(toByteArray("\xff"), true);
 checkAll(toByteArray("\xed\xa0\x8f"), true);        // surrogate code points
 checkAll(toByteArray("\xe0\x82\x80"), true);        // overlong sequence
 checkAll(toByteArray("\xf4\x90\x80\x80"), true);    // beyond limit: U+110000
 checkAll(toByteArray("\xef\xbf\xbe"), true);        // non-character; U+FFFE
 checkAll(toByteArray("with\x00null"), false);