Revert of Rate limit programmatic update checks for extensions

extensions/browser/updater/extension_downloader.cc

Index: extensions/browser/updater/extension_downloader.cc
diff --git a/extensions/browser/updater/extension_downloader.cc b/extensions/browser/updater/extension_downloader.cc
index 6d94e8697669dd7efce8de52c0c1ae94a6359cf8..116ef7abb1561000f78029f313f49510d8e086ab 100644
--- a/extensions/browser/updater/extension_downloader.cc
+++ b/extensions/browser/updater/extension_downloader.cc
@@ -27,7 +27,6 @@
 #include "extensions/browser/extensions_browser_client.h"
 #include "extensions/browser/notification_types.h"
 #include "extensions/browser/updater/extension_cache.h"
-#include "extensions/browser/updater/extension_downloader_test_delegate.h"
 #include "extensions/browser/updater/request_queue_impl.h"
 #include "extensions/browser/updater/safe_manifest_parser.h"
 #include "extensions/common/extension_urls.h"
@@ -90,8 +89,6 @@
 const char kTokenServiceConsumerId[] = "extension_downloader";
 const char kWebstoreOAuth2Scope[] =
     "https://www.googleapis.com/auth/chromewebstore.readonly";
-
-ExtensionDownloaderTestDelegate* g_test_delegate = nullptr;
 
 #define RETRY_HISTOGRAM(name, retry_count, url)                           \
   if ((url).DomainIs(kGoogleDotCom)) {                                    \
@@ -281,12 +278,6 @@
   identity_provider_.swap(identity_provider);
 }
 
-// static
-void ExtensionDownloader::set_test_delegate(
-    ExtensionDownloaderTestDelegate* delegate) {
-  g_test_delegate = delegate;
-}
-
 bool ExtensionDownloader::AddExtensionData(const std::string& id,
                                            const Version& version,
                                            Manifest::Type extension_type,
@@ -414,11 +405,6 @@
 
 void ExtensionDownloader::StartUpdateCheck(
     scoped_ptr<ManifestFetchData> fetch_data) {
-  if (g_test_delegate) {
-    g_test_delegate->StartUpdateCheck(this, delegate_, std::move(fetch_data));
-    return;
-  }
-
   const std::set<std::string>& id_set(fetch_data->extension_ids());
 
   if (!ExtensionsBrowserClient::Get()->IsBackgroundUpdateAllowed()) {