Disable noisy printf in drive_integration_service.cc

chrome/browser/chromeos/drive/drive_integration_service.cc

 // Copyright (c) 2012 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 "chrome/browser/chromeos/drive/drive_integration_service.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "base/prefs/pref_service.h"
@@ skipping 133 matching lines @@
       dest_directory = downloads_directory.Append(
           base::FilePath::FromUTF8Unsafe(dest_directory_name))
           .InsertBeforeExtensionASCII(base::StringPrintf(" (%d)", uniquifier));
     }
 
     internal::ResourceMetadataStorage::RecoveredCacheInfoMap
         recovered_cache_info;
     metadata_storage->RecoverCacheInfoFromTrashedResourceMap(
         &recovered_cache_info);
 
-    LOG(WARNING) << "DB could not be opened for some reasons. "
-                 << "Recovering cache files to " << dest_directory.value();
+    LOG_IF(WARNING, !recovered_cache_info.empty())
+        << "DB could not be opened for some reasons. "
+        << "Recovering cache files to " << dest_directory.value();
     if (!cache->RecoverFilesFromCacheDirectory(dest_directory,
                                                recovered_cache_info)) {
       LOG(WARNING) << "Failed to recover cache files.";
       return FILE_ERROR_FAILED;
     }
   }
 
   FileError error = resource_metadata->Initialize();
   LOG_IF(WARNING, error != FILE_ERROR_OK)
       << "Failed to initialize resource metadata. " << FileErrorToString(error);
@@ skipping 452 matching lines @@
     service = new DriveIntegrationService(profile, preference_watcher,
                                           NULL, base::FilePath(), NULL);
   } else {
     service = factory_for_test_->Run(profile);
   }
 
   return service;
 }
 
 }  // namespace drive