Exclude mojo/examples from production related presubmit checks

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Review URL: https://codereview.chromium.org/87223002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237451 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 9ad9cd18..370c057 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -45,6 +45,8 @@
     r'content[/\\]shell[/\\].*',
     # At request of folks maintaining this folder.
     r'chrome[/\\]browser[/\\]automation[/\\].*',
+    # Non-production example code.
+    r'mojo[/\\]examples[/\\].*',
 )
 
 _TEST_ONLY_WARNING = (