Looking into all changed files to find actions.xml.

In case actions.xml is included in the changelist the chrome/browser/resources/PRESUBMIT.py shouldn't run because the presubmit for actions.xml will do more complete job.

Fixing the bug to look into all changed files in the CL where previously it was only looking at subdirectories of current presubmit script to find actions.xml

BUG=439978

Review URL: https://codereview.chromium.org/760163004

Cr-Commit-Position: refs/heads/master@{#308244}
diff --git a/PRESUBMIT_test_mocks.py b/PRESUBMIT_test_mocks.py
index f99671da..7d286b9d 100644
--- a/PRESUBMIT_test_mocks.py
+++ b/PRESUBMIT_test_mocks.py
@@ -24,6 +24,7 @@
     self.subprocess = subprocess
     self.files = []
     self.is_committing = False
+    self.change = MockChange([])
 
   def AffectedFiles(self, file_filter=None):
     return self.files