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 1441 matching lines @@
 
 DART_EXPORT void Dart_SetStickyError(Dart_Handle error) {
   Thread* thread = Thread::Current();
   DARTSCOPE(thread);
   Isolate* isolate = thread->isolate();
   CHECK_ISOLATE(isolate);
   NoSafepointScope no_safepoint_scope;
   if (isolate->sticky_error() != Error::null()) {
     FATAL1("%s expects there to be no sticky error.", CURRENT_FUNC);
   }
-  if (!Dart_IsUnhandledExceptionError(error)) {
+  if (!::Dart_IsUnhandledExceptionError(error)) {
     FATAL1("%s expects the error to be an unhandled exception error.",
             CURRENT_FUNC);
   }
   isolate->SetStickyError(
       Api::UnwrapErrorHandle(Z, error).raw());
 }
 
 
 DART_EXPORT bool Dart_HasStickyError() {
   Isolate* isolate = Isolate::Current();
@@ skipping 5115 matching lines @@
 
 DART_EXPORT bool Dart_IsPrecompiledRuntime() {
 #if defined(DART_PRECOMPILED_RUNTIME)
   return true;
 #else
   return false;
 #endif
 }
 
 }  // namespace dart