Remove some wstrings in test_shell.

webkit/tools/test_shell/test_shell_win.cc

Index: webkit/tools/test_shell/test_shell_win.cc
diff --git a/webkit/tools/test_shell/test_shell_win.cc b/webkit/tools/test_shell/test_shell_win.cc
index 5c1d7d8280c18608eb0d0c6e6c2724306afd11a3..e3de9320c39b2f90f0e72db5ce82c3137ba4b83a 100644
--- a/webkit/tools/test_shell/test_shell_win.cc
+++ b/webkit/tools/test_shell/test_shell_win.cc
@@ -475,7 +475,7 @@ void TestShell::ResizeSubViews() {
 }
 
 void TestShell::LoadURLForFrame(const GURL& url,
-                                const std::wstring& frame_name) {
+                                const string16& frame_name) {
   if (!url.is_valid())
     return;
 
@@ -490,7 +490,7 @@ void TestShell::LoadURLForFrame(const GURL& url,
   }
 
   navigation_controller_->LoadEntry(
-      new TestNavigationEntry(-1, url, std::wstring(), frame_name));
+      new TestNavigationEntry(-1, url, frame_name));
 }
 
 LRESULT CALLBACK TestShell::WndProc(HWND hwnd, UINT message, WPARAM wParam,