Switch to using the message loop rather than gtk_main().

webkit/tools/test_shell/test_shell_main_gtk.cc

Index: webkit/tools/test_shell/test_shell_main_gtk.cc
diff --git a/webkit/tools/test_shell/test_shell_main_gtk.cc b/webkit/tools/test_shell/test_shell_main_gtk.cc
index afee3e4f8085341649a49820ccff8ef0b67e7adf..48cf47af173c2614ab260df6021683910eae42ae 100644
--- a/webkit/tools/test_shell/test_shell_main_gtk.cc
+++ b/webkit/tools/test_shell/test_shell_main_gtk.cc
@@ -10,6 +10,7 @@
 #include "base/icu_util.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
+#include "base/message_loop.h"
 #include "webkit/tools/test_shell/test_shell.h"
 #include "webkit/tools/test_shell/test_shell_switches.h"
 
@@ -53,13 +54,14 @@ int main(int argc, char* argv[]) {
     uri = *iter;
   }
 
+  MessageLoopForUI main_message_loop;
+
   TestShell* shell;
   if (TestShell::CreateNewWindow(uri, &shell)) {
     // TODO(port): the rest of this.  :)
   }
 
-  // TODO(port): use MessageLoop instead.
-  gtk_main();
+  main_message_loop.Run();
 
   return 0;
 }