Add ExceptionHandler to ModuleSystem, remove heap allocated v8::TryCatch.

chrome/test/base/module_system_test.h

Index: chrome/test/base/module_system_test.h
diff --git a/chrome/test/base/module_system_test.h b/chrome/test/base/module_system_test.h
index bc9832ce492a05d85805c02a085105be13eb8f1e..457832b05b69fe633b5c6570322476dc0203b4cf 100644
--- a/chrome/test/base/module_system_test.h
+++ b/chrome/test/base/module_system_test.h
@@ -52,7 +52,6 @@ class ModuleSystemTest : public testing::Test {
 
   v8::Persistent<v8::Context> context_;
   v8::HandleScope handle_scope_;
-  v8::TryCatch try_catch_;
   AssertNatives* assert_natives_;
   scoped_ptr<StringSourceMap> source_map_;
   scoped_ptr<extensions::ModuleSystem> module_system_;