Remove the "one at a time" restriction from the browsingData API

chrome/browser/extensions/api/browsing_data/browsing_data_api.cc

Index: chrome/browser/extensions/api/browsing_data/browsing_data_api.cc
diff --git a/chrome/browser/extensions/api/browsing_data/browsing_data_api.cc b/chrome/browser/extensions/api/browsing_data/browsing_data_api.cc
index b15e0576bfebeb5c1805183ed5080d301481e2c0..827f9ead4e705fd33b179f8f3be175935fd9f369 100644
--- a/chrome/browser/extensions/api/browsing_data/browsing_data_api.cc
+++ b/chrome/browser/extensions/api/browsing_data/browsing_data_api.cc
@@ -65,8 +65,6 @@ const char kUnprotectedWebKey[] = "unprotectedWeb";
 const char kBadDataTypeDetails[] = "Invalid value for data type '%s'.";
 const char kDeleteProhibitedError[] = "Browsing history and downloads are not "
                                       "permitted to be removed.";
-const char kOneAtATimeError[] = "Only one 'browsingData' API call can run at "
-                                "a time.";
 
 }  // namespace extension_browsing_data_api_constants
 
@@ -314,14 +312,7 @@ void BrowsingDataRemoverFunction::CheckRemovingPluginDataSupported(
 void BrowsingDataRemoverFunction::StartRemoving() {
   BrowsingDataRemover* remover =
       BrowsingDataRemoverFactory::GetForBrowserContext(GetProfile());
-  // TODO(msramek): This restriction is no longer needed. Remove it.
-  if (remover->is_removing()) {
-    error_ = extension_browsing_data_api_constants::kOneAtATimeError;
-    SendResponse(false);
-    return;
-  }
-
-  // If we're good to go, add a ref (Balanced in OnBrowsingDataRemoverDone)
+  // Add a ref (Balanced in OnBrowsingDataRemoverDone)
   AddRef();
 
   // Create a BrowsingDataRemover, set the current object as an observer (so