Fixed bugs in the coverage tracker.

BUG=
TEST=

Review URL: https://webrtc-codereview.appspot.com/421003

git-svn-id: http://webrtc.googlecode.com/svn/trunk@1810 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/tools/quality_tracking/dashboard/add_coverage_data.py b/tools/quality_tracking/dashboard/add_coverage_data.py
index 1c9d9da..52a388a 100644
--- a/tools/quality_tracking/dashboard/add_coverage_data.py
+++ b/tools/quality_tracking/dashboard/add_coverage_data.py
@@ -55,7 +55,7 @@
       function_coverage = _parse_percentage(function_coverage_string)
 
     except ValueError as error:
-      logger.warn('Invalid parameter in request: %s.' % error)
+      logging.warn('Invalid parameter in request: %s.' % error)
       self.response.set_status(400)
       return