Fix some dart api functions to use the proper unwrap patterns.

vm/dart_api_impl_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 "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"
@@ skipping 551 matching lines @@
         &peer32,
         ExternalStringCallbackFinalizer);
     EXPECT_VALID(obj32);
     void* api_peer32 = NULL;
     EXPECT_VALID(Dart_ExternalStringGetPeer(obj32, &api_peer32));
     EXPECT_EQ(api_peer32, &peer32);
 
     Dart_ExitScope();
   }
 
-  EXPECT_EQ(peer8, 40);
-  EXPECT_EQ(peer16, 41);
-  EXPECT_EQ(peer32, 42);
+  EXPECT_EQ(40, peer8);
+  EXPECT_EQ(41, peer16);
+  EXPECT_EQ(42, peer32);
   Isolate::Current()->heap()->CollectGarbage(Heap::kOld);
-  EXPECT_EQ(peer8, 40);
-  EXPECT_EQ(peer16, 41);
-  EXPECT_EQ(peer32, 42);
+  EXPECT_EQ(40, peer8);
+  EXPECT_EQ(41, peer16);
+  EXPECT_EQ(42, peer32);
   Isolate::Current()->heap()->CollectGarbage(Heap::kNew);
-  EXPECT_EQ(peer8, 80);
-  EXPECT_EQ(peer16, 82);
-  EXPECT_EQ(peer32, 84);
+  EXPECT_EQ(80, peer8);
+  EXPECT_EQ(82, peer16);
+  EXPECT_EQ(84, peer32);
 }
 
 
 TEST_CASE(ListAccess) {
   const char* kScriptChars =
       "List testMain() {"
       "  List a = new List();"
       "  a.add(10);"
       "  a.add(20);"
       "  a.add(30);"
@@ skipping 4098 matching lines @@
   // We should have received the expected number of interrupts.
   EXPECT_EQ(kInterruptCount, interrupt_count);
 
   // Give the spawned thread enough time to properly exit.
   Isolate::SetInterruptCallback(saved);
 }
 
 #endif  // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64).
 
 }  // namespace dart