Add missing Dart_ExitScope calls in some of the VM unit tests.

runtime/vm/snapshot_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 "platform/globals.h"
 
 #include "include/dart_tools_api.h"
 #include "platform/assert.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart_api_impl.h"
@@ skipping 1519 matching lines @@
   {
     // Now Create an Isolate using the full snapshot and load the
     // script snapshot created above and execute it.
     TestCase::CreateTestIsolateFromSnapshot(full_snapshot);
     Dart_EnterScope();  // Start a Dart API scope for invoking API functions.
 
     // Load the test library from the snapshot.
     EXPECT(script_snapshot != NULL);
     result = Dart_LoadScriptFromSnapshot(script_snapshot, size);
     EXPECT_VALID(result);
+    Dart_ExitScope();
   }
 
   FLAG_load_deferred_eagerly = saved_load_deferred_eagerly_mode;
   Dart_ShutdownIsolate();
   free(full_snapshot);
   free(script_snapshot);
 }
 
 
 UNIT_TEST_CASE(ScriptSnapshot2) {
@@ skipping 100 matching lines @@
     result = Dart_Invoke(lib, NewString("test_s"), 0, NULL);
     EXPECT(Dart_IsError(result) == saved_enable_type_checks_mode);
 
     // Invoke the test_i function.
     result = Dart_Invoke(lib, NewString("test_i"), 0, NULL);
     EXPECT(Dart_IsError(result) == saved_enable_type_checks_mode);
 
     // Invoke the test_b function.
     result = Dart_Invoke(lib, NewString("test_b"), 0, NULL);
     EXPECT(Dart_IsError(result) == saved_enable_type_checks_mode);
+    Dart_ExitScope();
   }
   Dart_ShutdownIsolate();
   free(full_snapshot);
   free(script_snapshot);
 }
 
 
 TEST_CASE(IntArrayMessage) {
   StackZone zone(Thread::Current());
   uint8_t* buffer = NULL;
@@ skipping 1337 matching lines @@
   StackZone zone(Thread::Current());
   uint8_t* buffer;
   MessageWriter writer(&buffer, &zone_allocator, true);
   writer.WriteInlinedObjectHeader(kOmittedObjectId);
   // For performance, we'd like single-byte headers when ids are omitted.
   // If this starts failing, consider renumbering the snapshot ids.
   EXPECT_EQ(1, writer.BytesWritten());
 }
 
 }  // namespace dart