Dart: Removes C++ set for closing handles on an unhandled exception.

mojo/dart/embedder/test/validation_unittest.cc

Index: mojo/dart/embedder/test/validation_unittest.cc
diff --git a/mojo/dart/embedder/test/validation_unittest.cc b/mojo/dart/embedder/test/validation_unittest.cc
index 181f0bab8ada03213969da5bd5b6a05acc8431ef..8ee3e1e3dde9b671576fa7b4110ea4bb14e23551 100644
--- a/mojo/dart/embedder/test/validation_unittest.cc
+++ b/mojo/dart/embedder/test/validation_unittest.cc
@@ -42,8 +42,12 @@ static bool generateEntropy(uint8_t* buffer, intptr_t length) {
   return true;
 }
 
-static void exceptionCallback(bool* exception, Dart_Handle error) {
+static void exceptionCallback(bool* exception,
+                              int64_t* closed_handles,
+                              Dart_Handle error,
+                              int64_t count) {
   *exception = true;
+  *closed_handles = count;
 }
 
 // Enumerates files inside |path| and collects all data needed to run
@@ -120,6 +124,7 @@ static void RunTest(const std::string& test) {
 
   char* error = NULL;
   bool unhandled_exception = false;
+  int64_t closed_handles = 0;
   DartControllerConfig config;
   // Run with strict compilation even in Release mode so that ASAN testing gets
   // coverage of Dart asserts, type-checking, etc.
@@ -127,7 +132,7 @@ static void RunTest(const std::string& test) {
   config.script_uri = path.value();
   config.package_root = package_root.AsUTF8Unsafe();
   config.callbacks.exception =
-      base::Bind(&exceptionCallback, &unhandled_exception);
+      base::Bind(&exceptionCallback, &unhandled_exception, &closed_handles);
   config.entropy = generateEntropy;
   config.SetVmFlags(nullptr, 0);
   config.error = &error;
@@ -136,6 +141,7 @@ static void RunTest(const std::string& test) {
   bool success = DartController::RunSingleDartScript(config);
   EXPECT_TRUE(success) << error;
   EXPECT_FALSE(unhandled_exception);
+  EXPECT_EQ(closed_handles, 0);
 }
 
 TEST(DartTest, validation) {