[Reland] Refactor WebappRegistry into a singleton instance.

chrome/browser/browsing_data/browsing_data_remover.cc

Index: chrome/browser/browsing_data/browsing_data_remover.cc
diff --git a/chrome/browser/browsing_data/browsing_data_remover.cc b/chrome/browser/browsing_data/browsing_data_remover.cc
index fcd6a796af5f5a997392355b4f463b871dc62c15..e6b80a48e975bbb45d206bfae636d2f8f2a0fa7f 100644
--- a/chrome/browser/browsing_data/browsing_data_remover.cc
+++ b/chrome/browser/browsing_data/browsing_data_remover.cc
@@ -702,13 +702,8 @@ void BrowsingDataRemover::RemoveImpl(
     }
 
     // Clear the history information (last launch time and origin URL) of any
-    // registered webapps. The webapp_registry makes a JNI call into a Java-side
-    // AsyncTask, so don't wait for the reply.
-    waiting_for_clear_webapp_history_ = true;
-    webapp_registry_->ClearWebappHistoryForUrls(
-        filter,
-        base::Bind(&BrowsingDataRemover::OnClearedWebappHistory,
-                   weak_ptr_factory_.GetWeakPtr()));
+    // registered webapps.
+    webapp_registry_->ClearWebappHistoryForUrls(filter);
 #endif
 
     data_reduction_proxy::DataReductionProxySettings*
@@ -1160,15 +1155,9 @@ void BrowsingDataRemover::RemoveImpl(
   }
 
 #if BUILDFLAG(ANDROID_JAVA_UI)
-  if (remove_mask & REMOVE_WEBAPP_DATA) {
-    // Clear all data associated with registered webapps. The webapp_registry
-    // makes a JNI call into a Java-side AsyncTask, so don't wait for the reply.
-    waiting_for_clear_webapp_data_ = true;
-    webapp_registry_->UnregisterWebappsForUrls(
-        filter,
-        base::Bind(&BrowsingDataRemover::OnClearedWebappData,
-                   weak_ptr_factory_.GetWeakPtr()));
-  }
+  // Clear all data associated with registered webapps.
+  if (remove_mask & REMOVE_WEBAPP_DATA)
+    webapp_registry_->UnregisterWebappsForUrls(filter);
 
   // For now we're considering offline pages as cache, so if we're removing
   // cache we should remove offline pages as well.
@@ -1276,8 +1265,6 @@ bool BrowsingDataRemover::AllDone() {
          !waiting_for_clear_pnacl_cache_ &&
 #if BUILDFLAG(ANDROID_JAVA_UI)
          !waiting_for_clear_precache_history_ &&
-         !waiting_for_clear_webapp_data_ &&
-         !waiting_for_clear_webapp_history_ &&
          !waiting_for_clear_offline_page_data_ &&
 #endif
 #if defined(ENABLE_WEBRTC)
@@ -1536,18 +1523,6 @@ void BrowsingDataRemover::OnClearedPrecacheHistory() {
   NotifyIfDone();
 }
 
-void BrowsingDataRemover::OnClearedWebappData() {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  waiting_for_clear_webapp_data_ = false;
-  NotifyIfDone();
-}
-
-void BrowsingDataRemover::OnClearedWebappHistory() {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  waiting_for_clear_webapp_history_ = false;
-  NotifyIfDone();
-}
-
 void BrowsingDataRemover::OnClearedOfflinePageData(
     offline_pages::OfflinePageModel::DeletePageResult result) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);