Fixed a ton of Python lint errors, enabled python lint checking.

BUG=

Review URL: https://webrtc-codereview.appspot.com/1166004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3627 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/tools/quality_tracking/dashboard/load_coverage.py b/tools/quality_tracking/dashboard/load_coverage.py
index ba072d3..a02b733 100644
--- a/tools/quality_tracking/dashboard/load_coverage.py
+++ b/tools/quality_tracking/dashboard/load_coverage.py
@@ -10,18 +10,14 @@
 
 """Loads coverage data from the database."""
 
-__author__ = 'phoglund@webrtc.org (Patrik Höglund)'
-
-import logging
-
 from google.appengine.ext import db
 import gviz_api
 
 
 class CoverageDataLoader:
   """ Loads coverage data from the database."""
-
-  def load_coverage_json_data(self, report_category):
+  @staticmethod
+  def load_coverage_json_data(report_category):
     coverage_entries = db.GqlQuery('SELECT * '
                                    'FROM CoverageData '
                                    'WHERE report_category = :1 '