Move web modal dialog manager files into the constrained_window component.

components/web_modal/web_contents_modal_dialog_manager_unittest.cc

Index: components/web_modal/web_contents_modal_dialog_manager_unittest.cc
diff --git a/components/web_modal/web_contents_modal_dialog_manager_unittest.cc b/components/web_modal/web_contents_modal_dialog_manager_unittest.cc
index 75c749eb1c8c15acff9e6b3e9f9ed919724a04d2..43fc22ec55f03db9ac4e752d323df0b4932c8d56 100644
--- a/components/web_modal/web_contents_modal_dialog_manager_unittest.cc
+++ b/components/web_modal/web_contents_modal_dialog_manager_unittest.cc
@@ -123,17 +123,6 @@ class WebContentsModalDialogManagerTest
   DISALLOW_COPY_AND_ASSIGN(WebContentsModalDialogManagerTest);
 };
 
-SingleWebContentsDialogManager*
-WebContentsModalDialogManager::CreateNativeWebModalManager(
-    gfx::NativeWindow dialog,
-    SingleWebContentsDialogManagerDelegate* native_delegate) {
-  NOTREACHED();
-  return new TestNativeWebContentsModalDialogManager(
-      dialog,
-      native_delegate,
-      &unused_tracker);
-}
-
 // Test that the dialog is shown immediately when the delegate indicates the web
 // contents is visible.
 TEST_F(WebContentsModalDialogManagerTest, WebContentsVisible) {