Address Ivan's review comments.

Review URL: https://chromiumcodereview.appspot.com//9696048

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@5438 260f80e4-7a28-3924-810f-c04153c831b5

runtime/lib/date.cc

@@ -5,7 +5,6 @@
 #include "vm/bootstrap_natives.h"
 
 #include "vm/bigint_operations.h"
-#include "vm/exceptions.h"
 #include "vm/native_entry.h"
 #include "vm/object.h"
 #include "vm/os.h"

runtime/lib/isolate.cc

@@ -258,6 +258,7 @@ static char* BuildIsolateName(const char* script_name,
 DEFINE_NATIVE_ENTRY(IsolateNatives_start, 2) {
   Isolate* preserved_isolate = Isolate::Current();
   GET_NATIVE_ARGUMENT(Instance, runnable, arguments->At(0));
+  // arguments->At(1) unused.
   const Class& runnable_class = Class::Handle(runnable.clazz());
   const char* class_name = String::Handle(runnable_class.Name()).ToCString();
   const Library& library = Library::Handle(runnable_class.library());

runtime/vm/native_entry.h

@@ -7,6 +7,7 @@
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
+#include "vm/exceptions.h"
 #include "vm/native_arguments.h"
 #include "vm/verifier.h"