DriveFileSyncService listens to OnAuthenticated event to recover from unavailable state

chrome/browser/sync_file_system/drive_file_sync_service_unittest.cc

Index: chrome/browser/sync_file_system/drive_file_sync_service_unittest.cc
diff --git a/chrome/browser/sync_file_system/drive_file_sync_service_unittest.cc b/chrome/browser/sync_file_system/drive_file_sync_service_unittest.cc
index 2c57239758cb7ccf1a9c62316e502c5d84b5d860..85e85f9c01cd0b30e56a02a9e5acc145c9588b49 100644
--- a/chrome/browser/sync_file_system/drive_file_sync_service_unittest.cc
+++ b/chrome/browser/sync_file_system/drive_file_sync_service_unittest.cc
@@ -95,6 +95,7 @@ class DriveFileSyncServiceTest : public testing::Test {
     mock_drive_service_ = new StrictMock<google_apis::MockDriveService>;
 
     EXPECT_CALL(*mock_drive_service(), Initialize(&profile_));
+    EXPECT_CALL(*mock_drive_service(), AddObserver(_));
 
     sync_client_ = DriveFileSyncClient::CreateForTesting(
         &profile_,
@@ -117,6 +118,7 @@ class DriveFileSyncServiceTest : public testing::Test {
   }
 
   virtual void TearDown() OVERRIDE {
+    EXPECT_CALL(*mock_drive_service(), RemoveObserver(_));
     EXPECT_CALL(*mock_drive_service(), CancelAll());
 
     if (sync_service_) {