Remove many calls to Isolate::Current() in the dart embedding api by

runtime/vm/unit_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <stdio.h>
 
 #include "vm/unit_test.h"
 
 #include "vm/assembler.h"
 #include "vm/ast_printer.h"
@@ skipping 86 matching lines @@
 }
 
 
 Dart_Handle TestCase::library_handler(Dart_LibraryTag tag,
                                       Dart_Handle library,
                                       Dart_Handle url,
                                       Dart_Handle import_map) {
   if (tag == kCanonicalizeUrl) {
     return url;
   }
-  return Api::Success();
+  return Api::Success(Isolate::Current());
 }
 
 
 uword AssemblerTest::Assemble() {
   const Code& code = Code::Handle(Code::FinalizeCode(name_, assembler_));
   if (FLAG_disassemble) {
     OS::Print("Code for test '%s' {\n", name_);
     const Instructions& instructions =
         Instructions::Handle(code.instructions());
     uword start = instructions.EntryPoint();
@@ skipping 78 matching lines @@
 
 
 bool CompilerTest::TestCompileFunction(const Function& function) {
   Isolate* isolate = Isolate::Current();
   ASSERT(isolate != NULL);
   const Error& error = Error::Handle(Compiler::CompileFunction(function));
   return error.IsNull();
 }
 
 }  // namespace dart