Move JavaScriptDialogManager, JavascriptAppModalDialogViews to components/app_modal_dialogs

components/BUILD.gn

Index: components/BUILD.gn
diff --git a/components/BUILD.gn b/components/BUILD.gn
index 3ba3272710098fbe454b5b748c5d83b212aa4b72..ca08f6ee9d95e9805e4cdafc0923b5d1841fb9a6 100644
--- a/components/BUILD.gn
+++ b/components/BUILD.gn
@@ -195,6 +195,10 @@ group("all_components") {
     ]
   }
 
+  if (!is_ios) {
+    deps += [ "//components/app_modal_dialogs" ]
+  }
+
   if (toolkit_views) {
     deps += [ "//components/constrained_window" ]
   }