[Android] Enable lint warnings by default.

build/android/gyp/lint.py

Index: build/android/gyp/lint.py
diff --git a/build/android/gyp/lint.py b/build/android/gyp/lint.py
index 339d98fd6e4fe7d87c61b3fe145defb467b1dac1..bca8642bb4c2ea88f9061fb5c755581c26c92fe6 100755
--- a/build/android/gyp/lint.py
+++ b/build/android/gyp/lint.py
@@ -55,17 +55,15 @@ def _RunLint(lint_path, config_path, processed_config_path, manifest_path,
     print >> sys.stderr
     for issue in issues:
       issue_id = issue.attributes['id'].value
-      severity = issue.attributes['severity'].value
       message = issue.attributes['message'].value
       location_elem = issue.getElementsByTagName('location')[0]
       path = location_elem.attributes['file'].value
       line = location_elem.getAttribute('line')
       if line:
-        error = '%s:%s %s: %s [%s]' % (path, line, severity, message,
-                                       issue_id)
+        error = '%s:%s %s: %s [warning]' % (path, line, message, issue_id)
       else:
         # Issues in class files don't have a line number.
-        error = '%s %s: %s [%s]' % (path, severity, message, issue_id)
+        error = '%s %s: %s [warning]' % (path, message, issue_id)
       print >> sys.stderr, error
       for attr in ['errorLine1', 'errorLine2']:
         error_line = issue.getAttribute(attr)