Fixes some memory leaks in //runtime/bin

runtime/bin/platform.cc

Index: runtime/bin/platform.cc
diff --git a/runtime/bin/platform.cc b/runtime/bin/platform.cc
index f2f16befee58e56ea0bb3cd8ad3397c553958efb..75324f1077792a113b2d16226d7725df4db4b6a7 100644
--- a/runtime/bin/platform.cc
+++ b/runtime/bin/platform.cc
@@ -102,22 +102,18 @@ void FUNCTION_NAME(Platform_Environment)(Dart_NativeArguments args) {
   } else {
     Dart_Handle result = Dart_NewList(count);
     if (Dart_IsError(result)) {
-      Platform::FreeEnvironment(env, count);
       Dart_PropagateError(result);
     }
     for (intptr_t i = 0; i < count; i++) {
       Dart_Handle str = DartUtils::NewString(env[i]);
       if (Dart_IsError(str)) {
-        Platform::FreeEnvironment(env, count);
         Dart_PropagateError(str);
       }
       Dart_Handle error = Dart_ListSetAt(result, i, str);
       if (Dart_IsError(error)) {
-        Platform::FreeEnvironment(env, count);
         Dart_PropagateError(error);
       }
     }
-    Platform::FreeEnvironment(env, count);
     Dart_SetReturnValue(args, result);
   }
 }