Revert of Make extensions DSE persistent in browser prefs

components/search_engines/template_url_service.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/search_engines/template_url_service.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 466 matching lines @@
   DCHECK(!url.empty());
   template_url->data_.SetShortName(short_name);
   template_url->data_.SetKeyword(keyword);
   template_url->SetURL(url);
   return Add(std::move(template_url));
 }
 
 TemplateURL* TemplateURLService::AddExtensionControlledTURL(
     std::unique_ptr<TemplateURL> template_url,
     std::unique_ptr<TemplateURL::AssociatedExtensionInfo> info) {
+  DCHECK(loaded_);
   DCHECK(template_url);
   DCHECK_EQ(kInvalidTemplateURLID, template_url->id());
   DCHECK(info);
   DCHECK_NE(TemplateURL::NORMAL, template_url->type());
   DCHECK(
       !FindTemplateURLForExtension(info->extension_id, template_url->type()));
-
   template_url->extension_info_.swap(info);
 
+  KeywordWebDataService::BatchModeScoper scoper(web_data_service_.get());
   TemplateURL* template_url_ptr = AddNoNotify(std::move(template_url), true);
-  if (template_url_ptr)
+  if (template_url_ptr) {
+    if (template_url_ptr->extension_info_->wants_to_be_default_engine) {
+      UpdateExtensionDefaultSearchEngine();
+    }
     NotifyObservers();
+  }
 
   return template_url_ptr;
 }
 
 void TemplateURLService::Remove(TemplateURL* template_url) {
   RemoveNoNotify(template_url);
   NotifyObservers();
 }
 
 void TemplateURLService::RemoveExtensionControlledTURL(
     const std::string& extension_id,
     TemplateURL::Type type) {
   DCHECK(loaded_);
   TemplateURL* url = FindTemplateURLForExtension(extension_id, type);
   if (!url)
     return;
   // NULL this out so that we can call RemoveNoNotify.
+  // UpdateExtensionDefaultSearchEngine will cause it to be reset.
   if (default_search_provider_ == url)
     default_search_provider_ = nullptr;
+  KeywordWebDataService::BatchModeScoper scoper(web_data_service_.get());
   RemoveNoNotify(url);
+  UpdateExtensionDefaultSearchEngine();
   NotifyObservers();
 }
 
 void TemplateURLService::RemoveAutoGeneratedSince(base::Time created_after) {
   RemoveAutoGeneratedBetween(created_after, base::Time());
 }
 
 void TemplateURLService::RemoveAutoGeneratedBetween(base::Time created_after,
                                                     base::Time created_before) {
   RemoveAutoGeneratedForUrlsBetween(base::Callback<bool(const GURL&)>(),
@@ skipping 1435 matching lines @@
     UpdateProvidersCreatedByPolicy(
         &template_urls_,
         source == DefaultSearchManager::FROM_POLICY ? data : nullptr);
   }
 
   if (!data) {
     default_search_provider_ = nullptr;
   } else if (source == DefaultSearchManager::FROM_EXTENSION) {
     default_search_provider_ = FindMatchingExtensionTemplateURL(
         *data, TemplateURL::NORMAL_CONTROLLED_BY_EXTENSION);
-    DCHECK(default_search_provider_);
   } else if (source == DefaultSearchManager::FROM_FALLBACK) {
     default_search_provider_ =
         FindPrepopulatedTemplateURL(data->prepopulate_id);
     if (default_search_provider_) {
       TemplateURLData update_data(*data);
       update_data.sync_guid = default_search_provider_->sync_guid();
       if (!default_search_provider_->safe_for_autoreplace()) {
         update_data.safe_for_autoreplace = false;
         update_data.SetKeyword(default_search_provider_->keyword());
         update_data.SetShortName(default_search_provider_->short_name());
@@ skipping 500 matching lines @@
     const TemplateURLData& data,
     TemplateURL::Type type) {
   DCHECK_NE(TemplateURL::NORMAL, type);
   for (const auto& turl : template_urls_) {
     if (turl->type() == type &&
         TemplateURL::MatchesData(turl.get(), &data, search_terms_data()))
       return turl.get();
   }
   return nullptr;
 }
+
+void TemplateURLService::UpdateExtensionDefaultSearchEngine() {
+  TemplateURL* most_recently_intalled_default = nullptr;
+  for (const auto& turl : template_urls_) {
+    if ((turl->type() == TemplateURL::NORMAL_CONTROLLED_BY_EXTENSION) &&
+        turl->extension_info_->wants_to_be_default_engine &&
+        turl->SupportsReplacement(search_terms_data()) &&
+        (!most_recently_intalled_default ||
+         (most_recently_intalled_default->extension_info_->install_time <
+          turl->extension_info_->install_time)))
+      most_recently_intalled_default = turl.get();
+  }
+
+  if (most_recently_intalled_default) {
+    base::AutoReset<DefaultSearchChangeOrigin> change_origin(
+        &dsp_change_origin_, DSP_CHANGE_OVERRIDE_SETTINGS_EXTENSION);
+    default_search_manager_.SetExtensionControlledDefaultSearchEngine(
+        most_recently_intalled_default->data());
+  } else {
+    default_search_manager_.ClearExtensionControlledDefaultSearchEngine();
+  }
+}