Fix Windows build

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, 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 "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "lib/stacktrace.h"
@@ skipping 752 matching lines @@
   return Api::ClassId(object) == kApiErrorCid;
 }
 
 
 DART_EXPORT bool Dart_IsUnhandledExceptionError(Dart_Handle object) {
   return Api::ClassId(object) == kUnhandledExceptionCid;
 }
 
 
 DART_EXPORT bool Dart_IsCompilationError(Dart_Handle object) {
-  if (Dart_IsUnhandledExceptionError(object)) {
+  if (::Dart_IsUnhandledExceptionError(object)) {
     DARTSCOPE(Thread::Current());
     const UnhandledException& error =
         UnhandledException::Cast(Object::Handle(Z, Api::UnwrapHandle(object)));
     const Instance& exc = Instance::Handle(Z, error.exception());
     return IsCompiletimeErrorObject(Z, exc);
   }
   return Api::ClassId(object) == kLanguageErrorCid;
 }
 
 
@@ skipping 5816 matching lines @@
 
 DART_EXPORT bool Dart_IsPrecompiledRuntime() {
 #if defined(DART_PRECOMPILED_RUNTIME)
   return true;
 #else
   return false;
 #endif
 }
 
 }  // namespace dart