Don't persist and sync omnibox extension keywords.

chrome/browser/ui/search_engines/keyword_editor_controller.cc

Index: chrome/browser/ui/search_engines/keyword_editor_controller.cc
diff --git a/chrome/browser/ui/search_engines/keyword_editor_controller.cc b/chrome/browser/ui/search_engines/keyword_editor_controller.cc
index 9d8b106d44cb87b59a8b7fc53d86b6431f3c0031..909a51a3fc9b5d903f3f73a65d93e34f1d4cc501 100644
--- a/chrome/browser/ui/search_engines/keyword_editor_controller.cc
+++ b/chrome/browser/ui/search_engines/keyword_editor_controller.cc
@@ -61,9 +61,9 @@ void KeywordEditorController::ModifyTemplateURL(TemplateURL* template_url,
 }
 
 bool KeywordEditorController::CanEdit(const TemplateURL* url) const {
-  return (url->GetType() != TemplateURL::NORMAL_CONTROLLED_BY_EXTENSION) &&
-      (!url_model_->is_default_search_managed() ||
-       (url != url_model_->GetDefaultSearchProvider()));
+  return url->GetType() == TemplateURL::NORMAL &&
+      !(url == url_model_->GetDefaultSearchProvider() &&
+        url_model_->is_default_search_managed());
 }
 
 bool KeywordEditorController::CanMakeDefault(const TemplateURL* url) const {
@@ -71,7 +71,8 @@ bool KeywordEditorController::CanMakeDefault(const TemplateURL* url) const {
 }
 
 bool KeywordEditorController::CanRemove(const TemplateURL* url) const {
-  return url != url_model_->GetDefaultSearchProvider();
+  return url->GetType() ==  TemplateURL::NORMAL &&
+      url != url_model_->GetDefaultSearchProvider();
 }
 
 void KeywordEditorController::RemoveTemplateURL(int index) {